Can sodium chloride conduct eletricity in the solid state ? (A)Solids do not conduct electricity. (B)The ions of NaCl become mobile only in molten state and are not free to move in solid state. (C)The crystalline structure does not have ions. (D)When a bond is formed between ions they lose their charges.

Options

A. Solids do not conduct electricity.
B. The ions of NaCl become mobile only in molten state and are not free to move in solid state.
C. The crystalline structure does not have ions.
D. When a bond is formed between ions they lose their charges.

Explanation

To determine whether sodium chloride (NaCl) can conduct electricity in the solid state, we need to analyze the properties of ionic compounds and their behavior in different states.

### Step-by-Step Solution:

1. **Understanding Ionic Compounds**: Sodium chloride is an ionic compound composed of sodium ions (Na⁺) and chloride ions (Cl⁻). In the solid state, these ions are arranged in a crystalline lattice structure.

**Hint**: Remember that ionic compounds consist of charged ions held together by electrostatic forces.

2. **Solid State Characteristics**: In the solid state, the ions in NaCl are fixed in their positions within the crystal lattice. They are not free to move around because they are held tightly by strong ionic bonds.

**Hint**: Think about how the arrangement of ions affects their mobility.

3. **Conductivity of Electricity**: For a substance to conduct electricity, it must have charged particles that are free to move. In the case of NaCl in solid form, there are no free-moving ions or electrons.

**Hint**: Consider what is necessary for electrical conductivity—movement of charge carriers.

4. **Comparison with Other States**: Sodium chloride can conduct electricity when it is melted (molten state) or dissolved in water (aqueous state). In these states, the ionic bonds are broken, allowing the ions to move freely.

**Hint**: Recall the difference between solid, molten, and aqueous states regarding ion mobility.

5. **Evaluating the Options**:
- (A) "Solids do not conduct electricity." - This is incorrect because some solids, like metals, can conduct electricity.
- (B) "The ions of NaCl become mobile only in molten state and are not free to move in solid state." - This is correct.
- (C) "The crystalline structure does not have ions." - This is incorrect because the crystalline structure of NaCl consists of ions.
- (D) "When a bond is formed between ions they lose their charges." - This is incorrect; ions retain their charges in the solid state.

**Hint**: Carefully analyze each option to see if it accurately reflects the properties of NaCl in solid state.

6. **Conclusion**: The correct answer is (B) because it accurately describes the behavior of NaCl in the solid state.

### Final Answer:
**(B) The ions of NaCl become mobile only in molten state and are not free to move in solid state.**