5a Chemical Bond I

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Question 1 of 9

1. Question
1 point(s)
Which of the following elements do not form any chemical bond with other elements under room temperature and pressure? [The symbol used is not the actual symbol of the element.]
- 1. I. Element: W
  Proton Number: 10
- 2. II. Element: X
  Proton Number: 15
- 3. III. Element: Y
  Proton Number: 18
- 4. IV. Element: Z
  Proton Number: 2
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Question 2 of 9

2. Question
1 point(s)
Which of the following statements are not rue about group 18 elements
- 1. I. All group 18 elements have very stable electron arrangement.
- 2. II. All group 18 elements have 8 valence electrons.
- 3. III. They form monoatomic gases in nature.
- 4. IV. They are chemically inert.
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Question 3 of 9

3. Question
1 point(s)
Which of the following atom that has nucleon number and proton number as shown below, would readily form an ion with a charge of +2?
- 1. Nucleon number: 41
  Proton number: 20
- 2. Nucleon number: 32
  Proton number: 16
- 3. Nucleon number: 16
  Proton number: 8
- 4. Nucleon number: 37
  Proton number: 18
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Question 4 of 9

4. Question
1 point(s)
Sodium atoms and sodium ions
- 1. have same physical properties.
- 2. have same number of protons.
- 3. have same number of electrons.
- 4. have same chemical properties.
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Question 5 of 9

5. Question
1 point(s)
Which of the following group below contains only ionic compounds?
- 1. copper(II) sulphate, hydrogen chloride, magnesium oxide
- 2. carbon dioxide, copper(II) sulphate, sodium chloride
- 3. carbon dioxide, copper(II) sulphate, hydrogen chloride
- 4. sodium chloride, magnesium oxide, potassium iodide
- 5. calcium chloride, carbon dioxide, magnesium oxide
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Question 6 of 9

6. Question
1 point(s)
The noble gases exist as mono-atomic gases in nature because
- 1. they have valence electrons with very low energy.
- 2. they are insoluble in water
- 3. they have 2 or 8 electrons which is very stable.
- 4. they have duplet or octet electron arrangement which is very stable.
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Question 7 of 9

7. Question
1 point(s)
Which of the following pair of ions has the same number of electrons?
[Proton Number: H, 1; Li, 3; Na, 11; Mg, 12; S, 16; Cl, 17; Ca, 20]
- 1. Na⁺ and Cl-
- 2. Ca²⁺ and Cl-
- 3. Mg²⁺ and S²⁻
- 4. H⁺ and Li⁺
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Question 8 of 9

8. Question
1 point(s)
Which of the following diagram shows the correct electron arrangement of a chloride ion?
[Proton number of chlorine = 17]
- 1.
- 2.
- 3.
- 4.
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Question 9 of 9

9. Question
1 point(s)
The electron arrangement of Y²⁻ ion is 2.8.8 and it has 16 neutrons in its nucleus. Which of the following is most likely the relative atomic mass of Y?
- 1. 16
- 2. 32
- 3. 18
- 4. 34
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