Why do many ionic compounds have high melting points?

They have strong electrostatic attractions between ions

They contain weak intermolecular forces

They contain only neutral atoms

Why does solid sodium chloride not conduct electricity effectively?

Its ions are fixed in the crystal lattice

It contains no charged particles

Class 9 Chemistry · Chapter 3 · Test 6

Ionic vs Covalent Compounds

25 MCQs covering the physical properties of ionic and covalent compounds, melting and boiling points, solubility, electrical conductivity, crystal lattices, and the relationship between bonding and physical properties.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
What type of structure is commonly formed by ionic compounds?
- AA crystal lattice of ions
- BSeparate metal atoms
- CA network of neutral gases
- DIndividual protons
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Answer: A
Ionic compounds commonly form regular crystal lattices of positive and negative ions.
Question 2
Why do many ionic compounds have high melting points?
- AThey contain weak intermolecular forces
- BThey have strong electrostatic attractions between ions
- CThey contain only neutral atoms
- DThey have no attractive forces
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Answer: B
Strong electrostatic attractions between oppositely charged ions require considerable energy to overcome.
Question 3
Which substance is most likely to have a low melting point?
- ASodium chloride
- BMagnesium oxide
- CWater
- DCalcium fluoride
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Answer: C
Water is a molecular substance with a relatively low melting point compared with common ionic solids.
Question 4
Which type of compound commonly conducts electricity when molten?
- AIonic compounds
- BCovalent molecular compounds
- CAll gases
- DAll solid molecular compounds
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Answer: A
When molten ionic compounds have mobile ions that can carry electric charge.
Question 5
Why does solid sodium chloride not conduct electricity effectively?
- AIts ions are fixed in the crystal lattice
- BIt contains no charged particles
- CIt has freely moving electrons
- DIt is made of metal atoms
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Answer: A
The ions in solid sodium chloride are held in fixed positions and cannot move freely to carry charge.

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