Chemistry Ch. 13 S And P Block Elements
Questions and Answers
- 1.
On of the following alkali metals is most reactive. which is that?
- A.
Ca
- B.
Cs
- C.
Na
- D.
Mg
Correct Answer
B. CsExplanation
Cs (Cesium) is the most reactive alkali metal because it has the largest atomic radius and the lowest ionization energy among the options given. The larger the atomic radius, the easier it is for the outermost electron to be removed, resulting in a lower ionization energy. Cs has the largest atomic radius, making it easier for its outermost electron to be removed, thus making it the most reactive alkali metal.Rate this question:
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- 2.
Elements of Group I - A give colours in flame. it is due to their;
- A.
Low melting point
- B.
Softness
- C.
Single electron in the outer most orbit
- D.
Low ionization energy
Correct Answer
C. Single electron in the outer most orbitExplanation
The elements in Group I-A give colors in flame due to their single electron in the outermost orbit. When these elements are heated, the outermost electron absorbs energy and jumps to a higher energy level. As the electron returns to its original energy level, it releases the absorbed energy in the form of visible light, which gives rise to the characteristic colors observed in flames.Rate this question:
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- 3.
One of the following statements regarding alkali metals is not correct. indicate that.
- A.
The hydroxides are alkaline in nature
- B.
They belong to s-block of periodic table
- C.
Alkali metals are very reactive
- D.
They form carbonates which decompose on heating
Correct Answer
D. They form carbonates which decompose on heatingExplanation
The statement "they form carbonates which decompose on heating" is incorrect. Alkali metals do form carbonates, but these carbonates are stable and do not decompose on heating.Rate this question:
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- 4.
Measure of the tendency of an atom to attract a bonding pair of electron is called
- A.
Ionization energy
- B.
Electron affinity
- C.
Electronegativity
- D.
Atomic radius
Correct Answer
C. ElectronegativityExplanation
Electronegativity is a measure of an atom's tendency to attract a bonding pair of electrons. It indicates the ability of an atom to attract and hold onto electrons in a chemical bond. It is an important concept in understanding the polarity of chemical bonds and the distribution of electrons in molecules.Rate this question:
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- 5.
The atomic radii decrease as we move from left to right in a period. This is because;
- A.
number of electrons increase
- B.
Number of neutrons increase
- C.
Nuclear charge increase
- D.
Atomic number increase
Correct Answer
C. Nuclear charge increaseExplanation
The correct answer is "nuclear charge increase". As we move from left to right in a period, the number of protons in the nucleus increases. This leads to a greater positive charge in the nucleus, which attracts the electrons more strongly and pulls them closer to the nucleus. As a result, the atomic radius decreases. The other options mentioned - number of electrons increase, number of neutrons increase, and atomic number increase - do not directly affect the atomic radius in the same way as the increase in nuclear charge.Rate this question:
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- 6.
The most electronegative element fluorine has electronegativity value 4. Cs is least electronegative. what is its electronegativity value?
- A.
0.4
- B.
0.2
- C.
0.5
- D.
0.7
Correct Answer
D. 0.7Explanation
Fluorine is known to be the most electronegative element with an electronegativity value of 4. Since Cs is stated to be the least electronegative element, it can be inferred that its electronegativity value would be lower than that of fluorine. Among the given options, the closest value to being lower than 4 is 0.7. Therefore, the electronegativity value of Cs is 0.7.Rate this question:
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- 7.
Silicon is a;
- A.
Good conductor
- B.
Poor conductor
- C.
Semiconductor
- D.
Electrolyre
Correct Answer
C. SemiconductorExplanation
Silicon is a semiconductor because it has properties of both conductors and insulators. It can conduct electricity under certain conditions, but not as well as a good conductor like copper or silver. At the same time, it can also act as an insulator and resist the flow of electricity. This makes silicon a crucial material in the field of electronics, as it can be used to control the flow of current in devices such as transistors and diodes.Rate this question:
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- 8.
Sulfur burns with
- A.
Yellow flame
- B.
Blue flame
- C.
Green flame
- D.
Red flame
Correct Answer
B. Blue flameExplanation
Sulfur burns with a blue flame because when sulfur reacts with oxygen, it undergoes combustion and produces sulfur dioxide gas. The blue flame is an indication of a complete combustion process, where there is sufficient oxygen available for the reaction. The blue color is a result of the excitation of electrons in the sulfur molecules, which emit light in the blue region of the electromagnetic spectrum.Rate this question:
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- 9.
Phosphorus burns with
- A.
White flame
- B.
Yellow flame
- C.
Red flame
- D.
Green flame
Correct Answer
A. White flameExplanation
Phosphorus burns with a white flame because when it is heated, the energy causes the electrons in the phosphorus atoms to become excited. As the electrons return to their ground state, they release energy in the form of light. The specific wavelengths of light emitted by phosphorus correspond to the color white, resulting in a white flame.Rate this question:
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- 10.
What is the color of Aluminium chloride
- A.
White
- B.
Brown
- C.
Purple
- D.
Pale yellow
Correct Answer
D. Pale yellowExplanation
Aluminium chloride is pale yellow in color.Rate this question:
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- 11.
The nature of metallic oxides is
- A.
Acidic
- B.
Basic
- C.
Neutral
- D.
Amphoteric
Correct Answer
B. BasicExplanation
Metallic oxides are generally basic in nature. This is because they react with water to form metal hydroxides, which are alkaline in nature. These oxides have a tendency to donate hydroxide ions (OH-) when dissolved in water, resulting in a basic solution. Examples of basic metallic oxides include sodium oxide (Na2O) and calcium oxide (CaO).Rate this question:
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- 12.
Which of the trimeric formula represents sulfur tri-oxide?
- A.
SO3
- B.
S3O9
- C.
S2O6
- D.
S2O2
Correct Answer
B. S3O9Explanation
The correct answer is S3O9. This is because the trimeric formula for sulfur tri-oxide is represented by S3O9, which indicates that there are three sulfur atoms and nine oxygen atoms in the compound. The other options, SO3, S2O6, and S2O2, do not accurately represent the trimeric formula for sulfur tri-oxide.Rate this question:
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- 13.
The formula of sodium hypochlorite is
- A.
NaCl
- B.
NaClO4
- C.
NaClO3
- D.
NaOCl
Correct Answer
D. NaOClExplanation
The correct answer is NaOCl. Sodium hypochlorite is a chemical compound made up of sodium, oxygen, and chlorine. The formula NaOCl represents the correct combination of these elements. NaCl, NaClO4, and NaClO3 do not accurately represent the composition of sodium hypochlorite.Rate this question:
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- 14.
Which of the following form giant covalent oxide?
- A.
Phosphorus (V) oxide
- B.
Carbon dioxide
- C.
Silicon dioxide
- D.
Sulfur trioxide
Correct Answer
C. Silicon dioxideExplanation
Silicon dioxide is a giant covalent oxide because it consists of a three-dimensional network of covalent bonds between silicon and oxygen atoms. Each silicon atom is bonded to four oxygen atoms, and each oxygen atom is bonded to two silicon atoms. This results in a strong and stable structure, making silicon dioxide a solid with a high melting and boiling point. In contrast, phosphorus (V) oxide, carbon dioxide, and sulfur trioxide do not form giant covalent structures and have different bonding arrangements.Rate this question:
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- 15.
Aluminium hydroxide is ___________ in nature
- A.
Acidic
- B.
Alkaline
- C.
Neutral
- D.
Amphoteric
Correct Answer
D. AmphotericExplanation
Aluminium hydroxide is considered amphoteric because it can act as both an acid and a base. It can react with acids to form salts and water, and it can also react with bases to form complex ions. This dual nature allows aluminium hydroxide to exhibit both acidic and alkaline properties, making it amphoteric.Rate this question:
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Mar 17, 2023Quiz Edited by
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Jul 13, 2020Quiz Created by
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