Question

Metal M is a major constituent of steel. On reaction with dilute hydrochloric acid, M releases a gas G which burns with a pop sound along with the formation of a greenish coloured solution C.

(ii) Which of the following is the correct formula of solution 'C’?

• A. $\text{FeCl}$
• B. ${\text{MgCl}}_2$
• C. ${\text{FeCl}}_2$
• D. $\text{MgCl}$

Answer 1

The correct option is C ${\text{FeCl}}_2$

Generally, when a metal reacts with dilute acid, it produces salt and hydrogen gas. Here, iron reacts with dilute hydrochloric acid and results in the formation of a greenish solution of iron chloride along with the evolution of hydrogen gas.

$\text{Fe}\left(s\right)+\text{dil.2HCl}\left(aq\right)\to {\text{FeCl}}_2\left(aq\right)+{\text{H}}_2\left(g\right)$

Therefore, the greenish solution is iron chloride (${\text{FeCl}}_2$).