Question

A salt can be prepared in the laboratory by reacting:

• A. metal and dilute sulphuric acid
• B. metal and dilute hydrochloric acid
• C. metal carbonate and dilute hydrochloric acid
• D. All options are correct

Answer 1

The correct option is D

All options are correct

Salts can be produced by the reaction of metals, metal carbonates, metal hydroxide, or oxide with an acid.

$\mathrm{X}+\mathrm{Acid}\stackrel{}{\to }\mathrm{Salt}+\mathrm{Water}$

Here X = metals, metal carbonates, metal hydroxide, or oxide.

For example:

1. A metal like zinc (Zn) on reaction with dilute sulphuric acid $\left({\mathrm{H}}_2{\mathrm{SO}}_4\right)$ gives out zinc sulphate $\mathrm{Zn}\left({\mathrm{SO}}_4\right)$ and hydrogen gas (H₂).
2. A metal like Zinc on reaction with dilute hydrochloric acid (HCl) gives out zinc chloride$\left({\mathrm{ZnCl}}_2\right)$ and hydrogen gas.
3. A metal carbonate like zinc carbonate $\left({\mathrm{ZnCO}}_3\right)$ on reaction with dilute hydrochloric acid gives out zinc chloride and carbonic acid$\left({\mathrm{H}}_2{\mathrm{CO}}_3\right)$.

As zinc sulphate and zinc chloride are salts, therefore all the given options are correct.

Hence, the correct option is (D).