Question

Match each substance $A$ to $E$listed below with the appropriate description in parts$\left(i\right)$ to$\left(v\right)$:

(A) Sulphur (B) Silver chloride (C)Hydrogen chloride (D)Copper (II) sulphate (E) Graphite

(i) A non metal which is good conductor of electricity.

(ii) A covalent compound which behaves like an ionic compound in aqueous solution.

(iii) A compound that is insoluble in cold water but solvable in excess ammonia solution

(iv) A pink metal deposited at cathode during the electrolysis of the solution of this salt.

(v) A non-metal which reacts with concentrated nitric acid to form its own acid as one of the product.

Answer 1

Explanation for correct answers:
The correct option is $\left(i\right)$A non-metal which is a good conductor of electricity. This property of graphite is due to its sheet-like $2D$ structure. In the structure, carbon atoms form $3$covalent bonds with $3$ other atoms, and one electron is left unbonded. It is this free electron of every carbon atom that conducts electricity.
Explanation for incorrect answers:
1. Since it is not a compound, options $\left(ii\right)$ and $\left(iii\right)$are incorrect.
2. Since it is not a metal, option$\left(iv\right)$is also incorrect.
3. Since it does not react with nitric acid, option $\left(v\right)$is also incorrect.

Final answer:

The correct option is$\left(i\right)$A non-metal which is a good conductor of electricity.