STS - Student Testing Service

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  • 1/200 Questions

    An insulated tube with a movable piston at one end had 500j of heat added to it if during experiement the piston moves and does 75j of work on the atmosphere what change in energy of tube system ?

    • 775j
    • 500j
    • 425
    • -75
    • -425
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About This Quiz

ONLINE TEST INFORMATION MUST FOLLOW STEPS ​​​First Submit Your Detail below (9)No Negative Marks Online test divided into 10 portion each contain 20 mcqs No Back system after you go to next portion. If page was refresh then your all mcqs answer removed. TIMING 8:00 am to 8:00 pm See morethen link will be removed Time duration 150 minutes or 2:30 hour Please use android mobile or laptop or pc Ios ( iphone is not supported )

STS - Student Testing Service - Quiz

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  • 2. 

    The oxidation state of Nitrogen is most negative in which of the following compound ?

    • N2

    • N​​​​​​2​​​​​O

    • NO​​​​​2

    • NO​​​​​3

    • NH3

    Correct Answer
    A. NH3
    Explanation
    The oxidation state of Nitrogen is most negative in NH3 because in NH3, Nitrogen has a -3 oxidation state. In N2, Nitrogen has a 0 oxidation state as it is in its elemental form. In N2O, Nitrogen has a +1 oxidation state. In NO2, Nitrogen has a +4 oxidation state. In NO3, Nitrogen has a +5 oxidation state. Therefore, NH3 has the most negative oxidation state of Nitrogen.

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  • 3. 

    All combustion reactions are  ........Reactions?

    • Endothermic

    • Exothermic

    • Photo Chemical

    • Rearrangment

    Correct Answer
    A. Exothermic
    Explanation
    Combustion reactions are exothermic because they release heat and light energy. During combustion, a fuel reacts with oxygen to produce carbon dioxide, water, and heat. This release of heat energy is what makes combustion reactions exothermic.

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  • 4. 

    The anode at is electrode at which ........process occurs?

    • Oxidation

    • Reduction

    • Self Redox Reaction

    • None of these

    Correct Answer
    A. Oxidation
    Explanation
    The anode is the electrode where oxidation occurs. Oxidation is a chemical process in which a substance loses electrons, resulting in an increase in its oxidation state. At the anode, electrons are released, causing the substance to be oxidized. Therefore, the correct answer is "Oxidation."

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  • 5. 

    For a gas obeying boyles law ,if pressure is doubled than volume become ?

    • Half

    • Double

    • 4 time increase

    • 8 time increase

    Correct Answer
    A. Half
    Explanation
    According to Boyle's Law, the pressure and volume of a gas are inversely proportional at constant temperature. When the pressure is doubled, the volume of the gas will be halved. This can be explained by the fact that increasing the pressure of a gas compresses its particles closer together, resulting in a decrease in volume. Therefore, the correct answer is "Half."

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  • 6. 

    Which molecule has zero dipole movement?

    • NH​​​​​​​​​​3

    • SO​​​​​2

    • H​​​​​​2​​​​​O

    • CO​​​​​2

    Correct Answer
    A. CO​​​​​2
    Explanation
    CO2 has zero dipole moment because it is a linear molecule with the same atoms (two oxygen atoms) on both sides of the central carbon atom. The oxygen atoms have equal and opposite dipole moments, canceling each other out. This results in a symmetrical distribution of charge, making CO2 a nonpolar molecule with no net dipole moment.

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  • 7. 

    A process involving no Heat exchange is known as?

    • Isothermal process

    • Adiabatic process

    • Isometric process

    • Isobaric process

    Correct Answer
    A. Isothermal process
    Explanation
    An isothermal process is a process in which there is no exchange of heat with the surroundings. This means that the system remains at a constant temperature throughout the process. In an isothermal process, the heat added to the system is equal to the work done by the system, resulting in no net change in internal energy. Therefore, an isothermal process involves no heat exchange.

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  • 8. 

    Which of the following is Formula for a noncyclic saturated hydrocarbon?

    • C7H12

    • C7H18

    • C​​​​​​7​​​​​H​​​​14

    • C​​​​​​7​​​​​H​​​​16

    Correct Answer
    A. C​​​​​​7​​​​​H​​​​16
    Explanation
    The formula C7H16 represents a noncyclic saturated hydrocarbon. This is because the formula indicates that there are 7 carbon atoms (C7) and 16 hydrogen atoms (H16), which satisfies the requirements for a saturated hydrocarbon. A saturated hydrocarbon is a type of organic compound that contains only single bonds between carbon atoms and is fully saturated with hydrogen atoms. In this case, the formula indicates that there are no double or triple bonds between carbon atoms, making it a noncyclic saturated hydrocarbon.

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  • 9. 

    The oxidation state of Fe in K4[Fe(CN)6?

    • +3

    • +4

    • 0

    • +2

    • -2

    Correct Answer
    A. +2
    Explanation
    In the compound K4[Fe(CN)6], the overall charge of the compound is 0. Since potassium (K) has a charge of +1, the total charge contributed by potassium is +4. The cyanide ion (CN) has a charge of -1, so the total charge contributed by cyanide is -6. To balance the charges, the iron (Fe) ion must have a charge of +2. Therefore, the oxidation state of Fe in K4[Fe(CN)6] is +2.

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  • 10. 

    The colour of  phenolphthane in Basic medium ?

    • Red

    • Yellow

    • Blue

    • Pink

    • Colourless

    Correct Answer
    A. Pink
    Explanation
    In a basic medium, phenolphthalein turns pink. This is because phenolphthalein is a pH indicator that changes color depending on the acidity or basicity of the solution it is in. In basic solutions, phenolphthalein becomes pink due to the presence of hydroxide ions (OH-) which react with the indicator molecule, causing it to change color. Therefore, the correct answer is pink.

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  • 11. 

    How many pi Bond are present in N​​​​​​2?

    • 2

    • 3

    • No Pi bond

    • 1

    Correct Answer
    A. 2
    Explanation
    The correct answer is 2 because N2 molecule consists of a triple bond between two nitrogen atoms. A triple bond consists of one sigma bond and two pi bonds. Therefore, there are two pi bonds present in N2.

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  • 12. 

    When  a solution its pH is 3.2 then what will be its PoH .?

    • 5.8

    • 6.8

    • 9.8

    • 10.8

    • Same

    Correct Answer
    A. 10.8
    Explanation
    The pH and pOH of a solution are related by the equation pH + pOH = 14. Since the pH of the solution is given as 3.2, we can subtract this value from 14 to find the pOH. 14 - 3.2 = 10.8. Therefore, the pOH of the solution is 10.8.

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  • 13. 

    The Geometry Of NH3 is?

    • Planner Trigonal

    • Trigonal pyramidal

    • Tetrahydral

    • Bent angular

    Correct Answer
    A. Trigonal pyramidal
    Explanation
    The correct answer is trigonal pyramidal. In NH3 (ammonia), there are three bonding pairs and one lone pair of electrons around the central nitrogen atom. This arrangement leads to a pyramid-like shape, with the three hydrogen atoms positioned at the base and the lone pair at the apex. The bond angles between the hydrogen atoms are slightly less than 109.5 degrees, which is the ideal tetrahedral angle. Therefore, the geometry of NH3 is trigonal pyramidal.

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  • 14. 

    Balmer series Contain .......region of Light?

    • Visible

    • Ultraviolet

    • Infrared

    • For infrared 

    Correct Answer
    A. Visible
    Explanation
    The Balmer series is a series of spectral lines in the emission spectrum of hydrogen. It corresponds to transitions between energy levels in the hydrogen atom where the electron jumps to or from the second energy level. These transitions result in the emission of visible light. Therefore, the Balmer series contains the visible region of light.

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  • 15. 

    Rectified sprit contain how many percentage  of Alcohol?

    • 4%

    • 11%

    • 85%

    • 90%

    • 99.99%

    Correct Answer
    A. 85%
    Explanation
    Rectified spirit is a highly concentrated form of alcohol that is purified through a distillation process. It typically contains a high percentage of alcohol, often around 85%. This makes it suitable for various industrial and medical uses, as well as for making alcoholic beverages. The other options provided, such as 4%, 11%, 90%, and 99.99%, are not as accurate because they do not reflect the high concentration typically found in rectified spirit.

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  • 16. 

    Which of the following is Not   Isotope of Hydrogen  ?

    • Dueterium

    • Protium 

    • Uranium

    • Tritium

    • C&D both

    Correct Answer
    A. Uranium
    Explanation
    Uranium is not an isotope of hydrogen. Isotopes of hydrogen include deuterium, protium, and tritium. Uranium is a separate element and is not related to hydrogen isotopes.

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  • 17. 

    Coke is produced from bitumeious coal by

    • Cracking

    • Synthesis

    • Substitution

    • Destructive Destillation

    • Filteration

    Correct Answer
    A. Destructive Destillation
    Explanation
    Destructive distillation is the process used to produce coke from bituminous coal. In this process, coal is heated in the absence of air, causing it to break down into various by-products, including coke. This method is commonly used in the production of coke as it allows for the separation of valuable components such as coal gas, coal tar, and coke.

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  • 18. 

    Heating  phenol with Zn will yeilds?

    • Benzen

    • Benzoic Acid

    • Phenoxide acid

    • Chloro ethane

    • Cyclohexane

    Correct Answer
    A. Benzen
    Explanation
    Heating phenol with Zn will yield benzene. This is because Zn acts as a reducing agent and removes the hydroxyl group (-OH) from phenol, resulting in the formation of benzene.

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  • 19. 

    Formaldehyde +Ethyle Alcohol ..........product will Form?

    • Oxime

    • Formic acid

    • Ethonic acid

    • .Hemiacetal

    • NONE

    Correct Answer
    A. .Hemiacetal
    Explanation
    The reaction between formaldehyde and ethyl alcohol can result in the formation of a hemiacetal. A hemiacetal is formed when an alcohol group reacts with an aldehyde group, resulting in the formation of a new carbon-oxygen bond. In this case, the formaldehyde acts as the aldehyde group and ethyl alcohol acts as the alcohol group. Therefore, the correct answer is hemiacetal.

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  • 20. 

    Which of the following  factors has no effect on Boiling Point?

    • Pressure

    • Intermolecular forces

    • Amount of liquid

    • Impurties

    • None

    Correct Answer
    A. Amount of liquid
    Explanation
    The amount of liquid does not have an effect on boiling point because boiling point is determined by the temperature at which the vapor pressure of the liquid equals the atmospheric pressure. The amount of liquid does not affect this equilibrium condition.

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  • 21. 

    Which orbital has lowest energy?

    • 3d

    • 4s

    • 3p

    • 4f

    • 5f

    Correct Answer
    A. 3p
    Explanation
    The 3p orbital has the lowest energy among the given options. This is because the energy levels of orbitals increase as the principal quantum number (n) increases. In this case, the 3p orbital has a lower principal quantum number (n=3) compared to the 4s, 4f, and 5f orbitals, which have higher values of n. The 3d orbital also has a higher energy level than the 3p orbital, as the d orbitals have higher energy than the p orbitals within the same principal quantum number.

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  • 22. 

    Positively charged Oxygen when bonded with three  different  atoms or Groups of atom is called?

    • Oxygen ion

    • Oxime

    • Oxinium ion

    • Oxide ion

    • Hydroxide ion

    Correct Answer
    A. Oxinium ion
    Explanation
    When oxygen is bonded with three different atoms or groups of atoms, it forms a positively charged ion called oxinium ion. This ion is formed when oxygen gains three electrons, resulting in a positive charge. The other options listed are not correct because they either refer to different types of ions or compounds formed by oxygen.

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  • 23. 

    Graph Between volume and Tempreture at Constant pressure is

    • Stright line

    • Curved

    • Parabolic

    • None of these

    Correct Answer
    A. Stright line
    Explanation
    The graph between volume and temperature at constant pressure is a straight line because according to Charles's Law, the volume of a gas is directly proportional to its temperature when the pressure is held constant. As the temperature increases, the volume of the gas also increases in a linear manner. This relationship is represented by a straight line on the graph.

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  • 24. 

    : L,M and N are ideal gases .The molecular weights t  44,16, and 32 respectively the rate of diffusion of these Gases follows order

    • L>M>N

    • L>N>M

    • M=N=L

    • M>N>L

    Correct Answer
    A. M>N>L
    Explanation
    The rate of diffusion of gases is inversely proportional to their molecular weights. Since M has the lowest molecular weight, it will have the highest rate of diffusion. N has a higher molecular weight than M, so it will have a slower rate of diffusion. L has the highest molecular weight among the three gases, so it will have the slowest rate of diffusion. Therefore, the correct order of the rate of diffusion is M>N>L.

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  • 25. 

    Which of the Following Hydrocarbans lowest Melting point

    • Ethane

    • Propane

    • Butane

    • Pentane

    • Hexane

    Correct Answer
    A. Ethane
    Explanation
    The melting point of a hydrocarbon is determined by its molecular structure and intermolecular forces. Ethane, with the formula C2H6, has the lowest melting point among the given options. This is because ethane consists of only two carbon atoms and six hydrogen atoms, resulting in weaker intermolecular forces compared to the other hydrocarbons. Propane, butane, pentane, and hexane have larger and more complex molecular structures, leading to stronger intermolecular forces and higher melting points.

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  • 26. 

    The contact process  for preparation of H2SO4  the catalyst is used is

    • Fe

    • Sun light

    • V2O5

    • NO+NO2

    • Nickle

    Correct Answer
    A. V2O5
    Explanation
    V2O5 is the catalyst used in the contact process for the preparation of H2SO4. The contact process involves the oxidation of sulfur dioxide to sulfur trioxide, which is then converted to sulfuric acid. V2O5 acts as a catalyst in this process, facilitating the reaction by lowering the activation energy required for the conversion of sulfur dioxide to sulfur trioxide.

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  • 27. 

    H2+I2------>2HI  This reaction independent of

    • Temperature 

    • Concentration

    • Pressure

    • Reactants

    • Catalyst

    Correct Answer
    A. Pressure
    Explanation
    The given reaction, H2+I2->2HI, does not depend on pressure. Pressure is the force exerted by a gas on its surroundings and does not affect the formation of the products in this reaction. The reaction can proceed at any pressure, as long as the reactants are present. The rate of the reaction may be affected by pressure, but the overall outcome of the reaction remains the same.

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  • 28. 

    The Molecular Orbital picture of O2 indicates the

    • One unpaired Electron

    • Two unpaired Electrons

    • Three unpaired electron

    • One paired Electron

    • None of above

    Correct Answer
    A. Two unpaired Electrons
    Explanation
    The molecular orbital picture of O2 indicates two unpaired electrons. In molecular orbital theory, electrons are distributed in molecular orbitals formed by the overlap of atomic orbitals. In the case of O2, the molecular orbital diagram shows that there are two unpaired electrons in the antibonding pi* orbitals. This means that O2 has two unpaired electrons available for bonding, making it a paramagnetic molecule.

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  • 29. 

    With the increase of size down the Group the ionization enthalpies

    • Increase

    • Decrease

    • First increase then decrease

    • First Decrease and Then decrease

    Correct Answer
    A. Decrease
    Explanation
    As we move down a group in the periodic table, the size of the atoms increases due to the addition of new energy levels. This increase in size leads to a decrease in the effective nuclear charge experienced by the outermost electrons. As a result, these electrons are less strongly attracted to the nucleus and are easier to remove, leading to a decrease in ionization enthalpies. Therefore, the correct answer is "decrease".

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  • 30. 

    The property of being able to add enthalpies is based on the

    • Law of conservation of Heat

    • Law of activation of mass

    • First law of Thermodynamics

    • Law of E =mc2

    • Hess's Law

    Correct Answer
    A. Hess's Law
    Explanation
    Hess's Law states that the total enthalpy change of a reaction is independent of the pathway taken. This means that the enthalpy change of a reaction can be calculated by considering the enthalpy changes of the individual steps involved, regardless of the intermediate reactions or the method used to achieve the final reaction. In other words, the enthalpy change is additive and can be determined by summing the enthalpy changes of the individual steps. This property allows for the addition of enthalpies, making Hess's Law a fundamental principle in thermochemistry.

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  • 31. 

    All are electrophlic reaction Of Benzene Except

    • Nitration

    • Halogenation

    • Sulphonation

    • Alkylation and acylation

    • Conjugation

    Correct Answer
    A. Conjugation
    Explanation
    Conjugation is not an electrophilic reaction of benzene. Electrophilic reactions involve the attack of an electrophile on the electron-rich benzene ring. Nitration, halogenation, sulphonation, alkylation, and acylation are all examples of electrophilic reactions where an electrophile reacts with the benzene ring. However, conjugation refers to the delocalization of electrons in a molecule, which can occur in benzene due to its alternating double bonds. It is not a reaction in itself, but rather a property of the molecule.

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  • 32. 

    Night blindness is caused by deficiency of ....... Vitamin?

    • Vitamin A

    • Vitamin B

    • Vitamin C

    • Vitamin E

    • Vitamin D

    Correct Answer
    A. Vitamin A
    Explanation
    Night blindness is caused by a deficiency of Vitamin A. Vitamin A is essential for the proper functioning of the retina, which is responsible for vision in low light conditions. A lack of Vitamin A can lead to a condition called night blindness, where individuals have difficulty seeing in dim light or at night. Consuming foods rich in Vitamin A, such as carrots, spinach, and sweet potatoes, can help prevent night blindness and maintain good vision.

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  • 33. 

    Ammonia is prepared by ______ method

    • Nelson cell

    • Hyber process

    • Downs cell

    • Contact process

    • Solutions process

    Correct Answer
    A. Hyber process
    Explanation
    The correct answer is "Hyber process". However, there is no information provided in the question about the different methods of preparing ammonia. Therefore, it is not possible to provide a specific explanation for why the Hyber process is the correct answer.

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  • 34. 

    Oxidation of Secondary Alcohol product Gives

    • Aldehyde

    • Ketone

    • Carboxylic acid

    • Phenol

    • Esters

    Correct Answer
    A. Ketone
    Explanation
    The oxidation of a secondary alcohol results in the formation of a ketone. This is because secondary alcohols have two alkyl groups attached to the carbon atom bearing the hydroxyl group. During oxidation, the hydrogen atom attached to the carbon atom is removed, and the resulting carbonyl group forms a double bond with the carbon atom. This leads to the formation of a ketone, which contains a carbonyl group bonded to two alkyl or aryl groups.

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  • 35. 

    Which of the following Covalent Hydride?

    • NaBH4

    • ZnH2

    • NaH

    • CaH2

    • H2S

    Correct Answer
    A. H2S
    Explanation
    H2S is the correct answer because it is a covalent hydride. Covalent hydrides are compounds in which hydrogen is bonded to a nonmetallic element through a covalent bond. In H2S, hydrogen is bonded to sulfur through a covalent bond, making it a covalent hydride. The other options, NaBH4, ZnH2, NaH, and CaH2, are not covalent hydrides as they involve hydrogen bonding with metallic elements or ionic bonding.

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  • 36. 

    Rate determining step of SN1 reaction is always

    • Slow step

    • Fast step

    • Intermediate step

    • Second step

    • None of above

    Correct Answer
    A. Slow step
    Explanation
    The rate-determining step of an SN1 reaction is always the slow step. In an SN1 reaction, the leaving group first dissociates from the substrate, forming a carbocation intermediate. This step is relatively slow because it involves the breaking of a bond. The subsequent step, which involves the nucleophile attacking the carbocation, is fast in comparison. Therefore, the slow step, where the carbocation is formed, determines the overall rate of the reaction.

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  • 37. 

    The stable Electronic Configuration  of Cu=29

    • [Ar]4s1 ,3d10

    • [Ar]4s2,3d9

    • [Ar]4s0,3d10

    • [Ar]4s2,3d8

    Correct Answer
    A. [Ar]4s1 ,3d10
    Explanation
    The stable electronic configuration of Cu is [Ar]4s1, 3d10. This means that the Cu atom has a total of 29 electrons. The [Ar] represents the electron configuration of the noble gas argon, which has 18 electrons. The 4s1 indicates that there is one electron in the 4s orbital, and the 3d10 indicates that there are 10 electrons in the 3d orbital. This configuration is stable because it follows the Aufbau principle, which states that electrons fill orbitals in order of increasing energy.

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  • 38. 

    250 cm3 of the simple of hydrogen effuses four times as rapidly as 250 cm3 of an unknown gas. Calculate the molar mass of unknown gas.?

    • 45g/mol

    • 40g/mol

    • 32g/mol

    • 41g/mol

    • 38g/mol

    Correct Answer
    A. 32g/mol
  • 39. 

    Ruby is a crystal of:

    • Al2O3

    • PbO3

    • KO2

    • SO4

    • None

    Correct Answer
    A. Al2O3
    Explanation
    Ruby is a crystal of Al2O3, which is also known as aluminum oxide. Ruby is a red gemstone and is a variety of the mineral corundum. Corundum is composed of aluminum and oxygen, with the chemical formula Al2O3. Ruby gets its red color from trace amounts of the element chromium. It is a precious gemstone and is highly valued for its beauty and rarity.

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  • 40. 

    Mostly hydrogen are formed in laboratory from which Hydride?

    • CaH2

    • MgH2

    • NaH

    • ZnH2

    Correct Answer
    A. CaH2
    Explanation
    CaH2 is the correct answer because it is calcium hydride. Calcium hydride is commonly used in laboratories to generate hydrogen gas. When CaH2 reacts with water, it produces hydrogen gas and calcium hydroxide. This reaction is often used as a convenient method for generating hydrogen gas in the laboratory. Therefore, CaH2 is the most likely hydride to be used for the formation of hydrogen in a laboratory setting.

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  • 41. 

    Reverse Process of  Esterification is ?

    • Filtration

    • Sponification

    • Halogenation

    • Break down of Fats process

    Correct Answer
    A. Sponification
    Explanation
    The reverse process of esterification is saponification. Esterification is the process of combining an alcohol and an acid to form an ester, while saponification is the process of breaking down an ester into its original alcohol and acid components. Therefore, saponification is the reverse process of esterification. Filtration, halogenation, and the breakdown of fats are not related to the reverse process of esterification.

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  • 42. 

    Which of the following Molecule contain ionic, Covalent ,Co ordinate bonds?

    • NH3

    • H2O

    • NH4OH

    • CH4

    • Both B&C

    Correct Answer
    A. NH4OH
    Explanation
    NH4OH contains ionic, covalent, and coordinate bonds. The NH4+ ion in NH4OH has a covalent bond between nitrogen and hydrogen atoms. The OH- ion has an ionic bond between oxygen and hydrogen atoms. Additionally, the NH4+ ion donates a lone pair of electrons to the OH- ion, forming a coordinate bond. Therefore, NH4OH contains all three types of bonds.

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  • 43. 

    IUPAC name of CH3-CH=CH(C2H5)?

    • 3-pentene

    • 2 -Ethyl prop-1en

    • 2-Pentene

    • Pent-3ene

    Correct Answer
    A. 2 -Ethyl prop-1en
    Explanation
    The given compound has a propyl group (CH3-CH2-CH2-) attached to the double bond. The propyl group is substituted with an ethyl group (C2H5), hence the name "2-Ethyl prop-1en". The number 2 indicates the position of the ethyl group on the propyl chain, and the "en" ending indicates the presence of a double bond.

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  • 44. 

    N2 +3H2 ==>2NH3        In this reaction if pressure increase  then reaction Goes to ?

    • Forward

    • Backward

    • In Equilibrium

    • Independent of pressure

    • Intermediate Reactans and products

    Correct Answer
    A. Forward
    Explanation
    When the pressure is increased in the reaction N2 + 3H2 -> 2NH3, the reaction will shift forward. This is because increasing the pressure favors the side with fewer moles of gas. In this reaction, there are 4 moles of gas on the left side (N2 + 3H2) and only 2 moles of gas on the right side (2NH3). Therefore, increasing the pressure will cause the reaction to shift forward to reduce the number of gas molecules and reach a new equilibrium.

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  • 45. 

    The Order of photochemical Reactions is

    • First Order

    • Second order

    • Third order

    • Zero order

    Correct Answer
    A. Zero order
    Explanation
    In a zero-order photochemical reaction, the rate of the reaction is independent of the concentration of the reactants. This means that increasing or decreasing the concentration of the reactants will not affect the rate of the reaction. The rate of the reaction is solely determined by the intensity of the light source. This type of reaction is often observed when the reactants are present in excess and the reaction is limited by the availability of light.

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  • 46. 

    Diamond & Graphite :

    • Isomers

    • Isotopes

    • Allotrops

    • Both have same Hardness

    • Same strucutre

    Correct Answer
    A. Allotrops
    Explanation
    Diamond and graphite are both allotropes of carbon. Allotropes are different forms of an element that have the same chemical composition but different physical and structural properties. In the case of diamond and graphite, they have the same chemical composition of carbon atoms but have different physical properties. Diamond is the hardest known natural substance, while graphite is a soft and brittle material. Additionally, diamond has a three-dimensional crystal lattice structure, while graphite has a layered structure. Therefore, the correct answer is "Allotrops."

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  • 47. 

    SN2 Reactions are Carried by which Alkyle   halide

    • 1° alkyle halide

    • 2° alkyle halide

    • .3° alkyle halide

    • All alkyle halide

    • 1°& 2° Alkyle halide

    Correct Answer
    A. 1° alkyle halide
    Explanation
    SN2 reactions are nucleophilic substitution reactions in which a nucleophile attacks the carbon atom of an alkyl halide, resulting in the substitution of the halide with the nucleophile. These reactions occur through a one-step mechanism, where the nucleophile attacks the carbon atom from the backside, causing inversion of the stereochemistry. In SN2 reactions, the rate of reaction is highly dependent on the steric hindrance around the carbon atom. 1° alkyl halides have the least steric hindrance, making them the most reactive towards SN2 reactions compared to 2° and 3° alkyl halides, which have increasing steric hindrance. Therefore, 1° alkyl halides are the most suitable for SN2 reactions.

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  • 48. 

    Wood spirit is Also known as

    • Methanol

    • Ethanol

    • Propyle Alcohol

    • Phenol

    • Nephthol

    Correct Answer
    A. Methanol
    Explanation
    Methanol is also known as wood spirit because it can be produced by the destructive distillation of wood. It is a clear, colorless liquid that is highly flammable and toxic. Methanol is commonly used as a solvent and as a fuel in some vehicles.

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  • 49. 

    Tick the synonyms:                                    ABSOLUTE

    • Division

    • Complete

    • Small

    • Half

    • Protest

    Correct Answer
    A. Complete

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