Intej Chemistry Department (Diagnostic 1)
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The chemical formula for aluminium sulphate is Al2(SO4)3. What is its relative formula mass? [Relative atomic mass of O = 16, Al = 27 and S = 32]
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123
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150
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182
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342
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Intej Chemistry Department (Diagnostic 1) assesses foundational chemistry concepts through questions on atomic models, diffusion, phase changes, isotopes, and atomic mass. This quiz aims to evaluate understanding and application of basic chemical principles.
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- 2.
Which of the following isotopes is used in archaeology?
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Cobalt-60
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Carbon-14
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Iodine-131
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Phosphorus-32
Correct Answer
A. Carbon-14Explanation
Carbon-14 is used in archaeology because it is a radioactive isotope of carbon that is present in the atmosphere and absorbed by living organisms. When an organism dies, it no longer takes in carbon-14, and the amount of carbon-14 in its remains gradually decreases over time through radioactive decay. By measuring the remaining amount of carbon-14 in archaeological artifacts, scientists can determine their age and gain insights into past civilizations and events.Rate this question:
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- 3.
What is the number of molecules in 1 mole of ammonia, NH3? [Avogadro constant = 6.02 x 1023 mol-1]
Correct Answer
A.Explanation
The number of molecules in 1 mole of ammonia, NH3, is equal to Avogadro's constant, which is 6.02 x 10^23 mol-1. This constant represents the number of particles (atoms, molecules, or ions) in one mole of a substance. In this case, it refers to the number of NH3 molecules in 1 mole of ammonia.Rate this question:
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- 4.
Table 1 shows part of the Periodic Table of Elements. What are the electron arrangements for atom of elements X and Y?
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X = 2.1 Y = 2.7
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X = 2.1 Y = 2.8.7
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X = 2.8.1 Y = 2.7
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X = 2.8.1 Y = 2.8.7
Correct Answer
A. X = 2.1 Y = 2.8.7Explanation
The electron arrangement for element X is 2.1, meaning it has 2 electrons in the first energy level and 1 electron in the second energy level. The electron arrangement for element Y is 2.8.7, meaning it has 2 electrons in the first energy level, 8 electrons in the second energy level, and 7 electrons in the third energy level.Rate this question:
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- 5.
The relative molecular mass of a compound with formula Na2X2 O3 is 158. What is the relative atomic mass of element X? [ Relative atomic mass of O = 16 and Na = 23]
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120
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90
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64
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32
Correct Answer
A. 32Explanation
The relative molecular mass of a compound is the sum of the relative atomic masses of all the atoms in the compound. In this case, the compound has two sodium atoms (Na) and two X atoms, along with three oxygen atoms (O). Given that the relative atomic mass of sodium is 23 and the relative atomic mass of oxygen is 16, we can calculate the relative molecular mass as follows: (2 * 23) + (2 * X) + (3 * 16) = 158. Simplifying the equation, we get 46 + 2X + 48 = 158. Solving for X, we find that X = 32. Therefore, the relative atomic mass of element X is 32.Rate this question:
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- 6.
Which of the following metals burn with a very bright purplish flame in a gas jar filled with oxygen and produces a white residue?
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Lead
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Silver
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Sodium
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Potassium
Correct Answer
A. PotassiumExplanation
Potassium is the correct answer because it is an alkali metal that reacts vigorously with oxygen. When potassium is burned in a gas jar filled with oxygen, it produces a very bright purplish flame. The flame color is due to the excitation of electrons in the potassium atoms. The reaction also produces a white residue, which is potassium oxide (K2O).Rate this question:
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- 7.
Diagram 6 shows the electron arrangement in a molecule formed from atoms X and Y. Where is element Y placed in the Periodic Table of Elements?
Correct Answer
A. -
- 8.
Diagram 5 shows the standard representation of beryllium atom. What is the number of valence electrons of beryllium atom?
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2
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3
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4
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7
Correct Answer
A. 2Explanation
Beryllium has an atomic number of 4, which means it has 4 electrons. The diagram shows that there are 2 electrons in the outermost shell, which is also known as the valence shell. Therefore, the number of valence electrons in a beryllium atom is 2.Rate this question:
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- 9.
Table 3 shows the proton numbers of elements P, Q, R and S. Element Proton number P 5 Q 10 R 11 S 12 TABLE 3 Which of the following is the correct ion formula for the elements?
Correct Answer
A. -
- 10.
The mass of two atoms of element X is equal to that of three atoms of sulphur. What is the relative atomic mass of element X? [ Relative atomic mass of S = 32 ]
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96
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48
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32
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24
Correct Answer
A. 48Explanation
The relative atomic mass of element X is 48. This can be determined by comparing the mass of two atoms of X to that of three atoms of sulfur. Since the relative atomic mass of sulfur is 32, and the mass of three sulfur atoms is equal to the mass of two atoms of X, we can set up the equation (32 * 3) / 2 = 48. Therefore, the relative atomic mass of element X is 48.Rate this question:
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- 11.
Element T reacts with oxygen to produce a solid with a formula TO. What is the electron arrangement of T?
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2
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2.1
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2.8.1
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2.8.2
Correct Answer
A. 2.8.2Explanation
The electron arrangement of T is 2.8.2. This means that T has a total of 12 electrons. The first energy level can hold a maximum of 2 electrons, the second energy level can hold a maximum of 8 electrons, and the third energy level can hold a maximum of 8 electrons. Since T has 12 electrons, it fills the first energy level with 2 electrons, the second energy level with 8 electrons, and the third energy level with 2 electrons.Rate this question:
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- 12.
The following information is about atom A What is the electron arrangement of atom A?
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2.1
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2.2
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2.5
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2.8.1
Correct Answer
A. 2.1Explanation
The electron arrangement of atom A is 2.1. This means that atom A has 2 electrons in its first energy level and 1 electron in its second energy level.Rate this question:
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- 13.
Oxygen atom is different from oxide ion because oxide ion has
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More protons than oxygen atom
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More neutrons than oxygen atom
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More electrons than oxygen atom
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More shells occupied with electron than oxygen atom
Correct Answer
A. More electrons than oxygen atomExplanation
The oxide ion has more electrons than the oxygen atom. An atom of oxygen typically has 8 electrons, but when it gains two additional electrons, it becomes an oxide ion. This extra electron gives the oxide ion a negative charge, making it different from a regular oxygen atom.Rate this question:
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- 14.
Diagram 7 shows the symbols for two elements. Which of the following is true about elements X and Y?
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Element X reacts with element Y to form a compound with the formula XY
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The compound formed from elements X and Y has a low melting point.
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Both elements X and Y are monoatomic
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Element X cannot react with element Y
Correct Answer
A. Element X reacts with element Y to form a compound with the formula XYExplanation
Element X reacts with element Y to form a compound with the formula XY. This means that when element X and element Y combine, they create a compound in which the atoms of X and Y are bonded together, forming a molecule with the formula XY.Rate this question:
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- 15.
Which of the following pairs of physical properties of compound W that is formed through transferring of electrons?
Correct Answer
A. -
- 16.
Diagram 4 shows the curve obtained when a solid X is heated. Which of the following statements are true about the curve?
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I and III only
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I and IV only
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II and III only
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II and IV only
Correct Answer
A. I and IV onlyExplanation
The correct answer is I and IV only. This means that only statements I and IV are true about the curve. The explanation for this answer can be found by analyzing the information given in the question and the diagram. However, since the question and diagram are not provided, it is not possible to generate a specific explanation for this answer.Rate this question:
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- 17.
Table 5 shows the proton number of elements E and G Elements E and G combine to form a compound that
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Can conduct electricity in molten state
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Is soluble in organic solvents
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Has a low melting point
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Has a low density
Correct Answer
A. Can conduct electricity in molten stateExplanation
The fact that the compound formed by elements E and G can conduct electricity in the molten state suggests that it contains charged particles (ions) that are free to move and carry electric current. This indicates that the compound is likely to be an ionic compound, where the atoms of element E have given away electrons to the atoms of element G, forming positive and negative ions. In the molten state, these ions are free to move and conduct electricity.Rate this question:
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- 18.
The atomic size decreases across the Period 3 because the
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Proton number increases
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Nucleon number decreases
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Number of neutrons increases
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Number of shell occupies electron decreases
Correct Answer
A. Proton number increasesExplanation
As you move across Period 3 of the periodic table, the atomic size decreases because the proton number increases. The atomic size is determined by the balance between the attractive force of the protons in the nucleus and the repulsive force of the electrons in the electron cloud. As the number of protons increases, the attractive force becomes stronger, pulling the electrons closer to the nucleus and reducing the atomic size. Therefore, the increase in proton number is the reason for the decreasing atomic size across Period 3.Rate this question:
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- 19.
Diagram 1 shows the atomic model of an atom. Which of the following scientists suggested the model?
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Ernest Rutherford
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James Chadwick
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J.J. Thomson
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Neils Bohr
Correct Answer
A. James Chadwick -
- 20.
The following information shows the properties of element Q. Q is most probably
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Iron
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Sodium
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Sulphur
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Magnesium
Correct Answer
A. IronExplanation
Based on the given information, element Q is most probably iron.Rate this question:
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- 21.
An element M has two oxidation numbers, +1 and +2. Which of the following compounds formed by M is incorrect?
Correct Answer
A. -
- 22.
Bromine-80 and bromine-81 are isotopes. Both isotopes have 35 protons. Which of the following statements is true about the bromine isotopes?
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Bromine-80 has less electrons than bromine-81
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Both isotopes have the same number of neutrons
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Both isotopes have the same chemical properties
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Bromine-81 has more shells filled with electrons than bromine-80
Correct Answer
A. Both isotopes have the same chemical propertiesExplanation
Both isotopes have the same chemical properties because chemical properties are determined by the number and arrangement of electrons in an atom, not by the number of protons or neutrons. Isotopes of an element have the same number of protons and electrons, so their chemical properties remain the same. The number of neutrons does not affect the chemical behavior of an atom.Rate this question:
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- 23.
Which of the following gases has the biggest volume at room temperature and pressure? [ Relative molecular mass of NH3 = 17 , N2 = 28 , CO2 = 44 and SO2 = 64 ]
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7.0 g nitrogen gas
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4.2 g ammonia gas
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16.0 g sulphur dioxide gas
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22.0 g carbon dioxide gas
Correct Answer
A. 22.0 g carbon dioxide gasExplanation
Carbon dioxide gas (CO2) has the biggest volume at room temperature and pressure because it has the highest molar mass among the given gases. Molar mass is directly proportional to the volume occupied by a gas at a given temperature and pressure. Since CO2 has the highest molar mass of 44 g/mol, it will have the largest volume compared to the other gases with lower molar masses.Rate this question:
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- 24.
Diagram 3 shows the set up of apparatus to determine the electrical conductivity of a substance X The bulb lights up when X is
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Hydrogen chloride.
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Tetrachloromethane.
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Sodium chloride solid
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Potassium iodide solution
Correct Answer
A. Potassium iodide solutionExplanation
The bulb lights up when potassium iodide solution is used because potassium iodide is an electrolyte. Electrolytes are substances that conduct electricity when dissolved in water or in a molten state. When potassium iodide is dissolved in water, it dissociates into potassium ions (K+) and iodide ions (I-), which are free to move and carry electric charge. This movement of ions allows the flow of electric current, causing the bulb to light up.Rate this question:
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- 25.
Chlorine is a Group 17 element. Which of the following statements regarding chlorine is true?
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It exists as a liquid at room temperature
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It reacts with water to produce hydrogen gas
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It reacts with iron wool to form iron(II)chloride
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It reacts with potassium to form potassium chloride
Correct Answer
A. It reacts with potassium to form potassium chlorideExplanation
Chlorine is a Group 17 element, also known as a halogen. Halogens are highly reactive and tend to form compounds with other elements. Chlorine reacts with potassium to form potassium chloride, which is a common salt. This reaction is representative of the reactivity of chlorine and its ability to form compounds with other elements.Rate this question:
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- 26.
Diagram 2 shows the set up of apparatus to investigate the diffusion in a liquid. After a few hours, the whole test tube of water becomes purple in colour Which of the following statements explain the observation?
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Potassium manganate(VII) is denser than water.
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Matter is made up of particles that expand uniformly
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Matter is made up of particles that are moving randomly
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Particles in potassium manganate(VII) move faster in water
Correct Answer
A. Matter is made up of particles that are moving randomlyExplanation
The observation that the whole test tube of water becomes purple in color indicates that the particles of potassium manganate(VII) are spreading out and mixing with the water particles. This can only happen if the particles are moving randomly, as stated in the correct answer. If the particles were moving uniformly or if potassium manganate(VII) was denser than water, the color would not have spread throughout the entire test tube. Additionally, the speed of the particles is not relevant to the observation.Rate this question:
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- 27.
Which of the following solids changes to gaseous state when it is heated?
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Lead(II) iodide
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Silicon dioxide
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Ammonium chloride
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Copper(II) carbonate
Correct Answer
A. Ammonium chlorideExplanation
Ammonium chloride changes to a gaseous state when it is heated. This is because ammonium chloride is a compound that undergoes sublimation, which is the process of transitioning directly from a solid to a gas without passing through the liquid state. When heated, the solid ammonium chloride sublimes and turns into a gas, without forming a liquid phase in between.Rate this question:
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- 28.
An atom that receives an electron forms
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A cation
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An anion
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An ionic bond
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A covalent bond
Correct Answer
A. An anionExplanation
When an atom receives an electron, it gains a negative charge because the number of electrons is now greater than the number of protons. This negatively charged atom is called an anion. Anions are formed when non-metal atoms gain electrons to achieve a stable electron configuration. Therefore, the correct answer is "an anion."Rate this question:
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- 29.
A new element with symbol Nw is discovered. It has eight outer electrons in its atom. Which of the following statements is true?
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Nw exists as monoatomic.
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Nw is a solid at room temperature
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Nw reacts with sodium to form an ionic compound.
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Nw is a good conductor of electricity in solid state.
Correct Answer
A. Nw exists as monoatomic.Explanation
The element with symbol Nw has eight outer electrons, which indicates that it belongs to Group 18 of the periodic table, also known as the noble gases. Noble gases are known for their stable electron configurations and do not readily form compounds with other elements. Therefore, Nw exists as monoatomic, meaning it exists as individual atoms rather than forming compounds or molecules.Rate this question:
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- 30.
Three elements represented by the letters X, Y and Z are in Period 3 of the Periodic Table of Elements. The oxide of X is acidic, the oxide of Y is basic and the oxide of Z is amphoteric. Which of the following statements are correct about elements X, Y and Z?
- Proton number of elements increases from X, Y and Z.
- Atomic size of the elements decreases from Y, Z and X.
- The melting points of the elements increase from X, Y and Z.
- Electronegativity of the elements increase from Y, Z and X.
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I and III only
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II and IV only
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I, II and III only
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II, III and IV only
Correct Answer
A. II and IV onlyExplanation
The statement that is correct about elements X, Y, and Z is II and IV only. Atomic size generally decreases from left to right across a period, so the atomic size decreases from Y, Z, and X. Electronegativity also generally increases from left to right across a period, so the electronegativity increases from Y, Z, and X. The other statements, such as the proton number and the melting points, are not necessarily related to the acidic, basic, or amphoteric nature of the oxides and cannot be determined from the given information.Rate this question:
- 31.
Table 4 shows the relative atomic mass of elements Y and Z. Which of the following is true about the atoms of elements Y and Z?
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The mass of one atom of Z is 16 g
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The number of protons in atom Y is 80
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5 moles of Z have the same mass as 1 mole of Y
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The density of one atom of Y is 5 times that of an atom of Z
Correct Answer
A. 5 moles of Z have the same mass as 1 mole of YExplanation
The statement "5 moles of Z have the same mass as 1 mole of Y" is true because the relative atomic mass of Y is 5 times greater than that of Z. Therefore, in order to have the same mass, 5 moles of Z would be needed to equal the mass of 1 mole of Y.Rate this question:
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- 32.
The melting point of substance Z is -112oC and its boiling point is 78oC. What is the physical state of substance Z at room temperature?
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Gas
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Solid
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Liquid
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Gas and liquid
Correct Answer
A. LiquidExplanation
Based on the given information, the melting point of substance Z is -112oC and its boiling point is 78oC. Room temperature is typically around 20-25oC. Since the boiling point is higher than room temperature and the melting point is lower than room temperature, substance Z would be in a liquid state at room temperature.Rate this question:
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- 33.
Table 2 shows the nucleon number and the number of neutrons in of elements G and L. Which of the following is true about elements G and L?
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G is more reactive than L.
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G is more electropositive than L.
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Both dissolves in water to form an alkaline solution
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Melting point of element G is higher than that of element L
Correct Answer
A. G is more reactive than L.Explanation
Based on the information given in Table 2, the nucleon number and the number of neutrons are not relevant factors in determining reactivity or electropositivity. The fact that G is more reactive than L cannot be determined from the information given, so the answer is not supported. Therefore, the correct answer cannot be determined based on the given information.Rate this question:
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- 34.
Element Z and magnesium combine to form compound MgZ2. Which of the following represents the formula for a compound formed between carbon and element Z? [Proton number of C=6]
Correct Answer
A.Explanation
The formula for the compound formed between carbon and element Z would be CZ2.Rate this question:
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- 35.
Caesium metal is below sodium in Group 1 of the Periodic Table of Elements. Which of the following statements are true about caesium?
- Caesium is denser than sodium
- Caesium is more reactive than sodium
- Caesium atom is bigger than sodium atom
- Caesium is more electropositive than sodium
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I and III only
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II and IV only
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II, III and IV only
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I, II, III and IV
Correct Answer
A. II, III and IV onlyExplanation
Caesium is denser than sodium because it is located below sodium in Group 1 of the periodic table, meaning it has more mass packed into the same volume. Caesium is more reactive than sodium because it is further down the group and has a larger atomic radius, making it easier for it to lose an electron and form positive ions. Caesium atom is bigger than sodium atom because as you move down a group in the periodic table, the atomic radius increases. Caesium is more electropositive than sodium because it has a lower ionization energy, meaning it is more likely to lose an electron and form positive ions.Rate this question:
- 36.
The bromide of metal M has the formula MBr3 and sodium phosphate has the formula Na3 PO4 .What is the formula of the phosphate of metal M?
Correct Answer
A.Explanation
The formula of the phosphate of metal M is MPO4. This is because the valency of M in MBr3 is 3, and the valency of PO4 in Na3PO4 is also 3. Therefore, the metal M combines with the phosphate group (PO4) to form MPO4.Rate this question:
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- 37.
If the Avogadro number is represented by the letter x, what is the number of hydrogen gas particles, H2, with the molar volume of 24 dm3 mol-1 at room temperature and pressure?
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X
-
2x
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X-2
-
![Intej Chemistry Department (Diagnostic 1) - Quiz]()
Correct Answer
A. X -
- 38.
Diagram 8 shows the electron arrangement for an ion of element J. What are the number of protons and electrons in an atom of element J?
Correct Answer
A. -
- 39.
Ion W3+ has 14 neutrons and its electron arrangement is 2.8. What is the nucleon number of an atom of element W?
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13
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14
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24
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27
Correct Answer
A. 27Explanation
The nucleon number of an atom is equal to the sum of its protons and neutrons. Since Ion W3+ has 14 neutrons, we can deduce that it also has 14 protons. Therefore, the nucleon number of an atom of element W is 27 (14 protons + 14 neutrons).Rate this question:
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- 40.
An ion X2+ contains 20 neutrons and has a nucleon number of 40. Which of the following is true about ion X2+?
Correct Answer
A.Explanation
The ion X2+ has a charge of +2, which means it has lost two electrons. Since the ion has a nucleon number of 40 and contains 20 neutrons, we can determine that the ion has 20 protons. This is because the nucleon number is equal to the sum of the protons and neutrons in an atom. Therefore, the statement "The ion X2+ contains 20 protons" is true.Rate this question:
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