Question

Which of the following is not a conductor?
(a) Cu(metal)
(b) NaCl(aq)
(c) NaCl(molten)
(d) NaCl(solid)

Answer 1

Explanation:

(d) NaCl(solid).........

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Answer 2

NaCl (solid) does not conduct electricity. (Option d is correct)

• The solid-state of sodium chloride prevents the Na⁺ and Cl⁻ ions from carrying electric currents because they are not mobile.
• Solid sodium chloride cannot let electricity pass through it, so it can't be used as a conductor of electricity.
• However, when its aqueous solution or molten form is taken, electricity can be conducted because now the ions are free to move and carry currents.
• The solid-state structure of this compound Sodium Chloride is tightly packed and therefore restricts any kind of movement.
• Due to this the ions are unable to move and hence cannot conduct electricity.

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