Ionic bonding MCQs — Chemistry (page 2)

26. An ionic compound consists of

1. separate molecules
2. a giant lattice of oppositely charged ions
3. atoms only
4. metal atoms only

Answer: B) a giant lattice of oppositely charged ions

Explanation: Ionic compounds are giant lattices of positive and negative ions held by strong electrostatic attraction.

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27. Which compound contains ions with the same electron arrangement?

1. MgO
2. H₂O
3. CO₂
4. CH₄

Answer: A) MgO

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28. Which oxide is likely to be ionic?

1. Carbon dioxide
2. Sulfur dioxide
3. Magnesium oxide
4. Silicon dioxide

Answer: C) Magnesium oxide

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29. A solid has a high melting point and conducts only when molten. It is most likely

1. metallic
2. ionic
3. simple molecular
4. gas

Answer: B) ionic

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30. In sodium chloride lattice, positive particles are

1. Cl⁻ ions
2. Na⁺ ions
3. electrons
4. atoms

Answer: B) Na⁺ ions

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31. Which statement is correct?

1. Lithium chloride is ionic
2. Silicon dioxide is ionic
3. Both are ionic
4. Neither is ionic

Answer: A) Lithium chloride is ionic

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32. When magnesium oxide melts, what attraction is overcome?

1. Between molecules
2. Between oppositely charged ions
3. Between atoms in molecules
4. Between electrons and nuclei

Answer: B) Between oppositely charged ions

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33. Which statement about ionic compounds is incorrect?

1. Conduct when molten
2. Conduct when dissolved in water
3. Conduct when solid
4. Contain ions

Answer: C) Conduct when solid

Explanation: Solid ionic compounds do not conduct because the ions are fixed in the lattice. They conduct when molten or dissolved, when ions can move.

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34. Why do ionic compounds have high melting points?

1. Strong attractions between oppositely charged ions
2. Weak intermolecular forces
3. Metallic bonding
4. Strong covalent molecules

Answer: A) Strong attractions between oppositely charged ions

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35. Which substance is most likely ionic?

1. Melting point 50°C, non-conductor
2. Melting point 800°C, conducts when molten
3. Melting point −180°C
4. Gas at room temperature

Answer: B) Melting point 800°C, conducts when molten

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