On adding dilute sulphuric acid to a test tube containing a metal ' $X$ ', a colourless gas is produ

Question

On adding dilute sulphuric acid to a test tube containing a metal ' $X$ ', a colourless gas is produced when a burning match stick is brought near it. Which of the following correctly represents metal ' $X$ '?\

Professor PC Thomas Classes · Answer

(a) : Metal on reaction with dilute sulphuric acid produces salt along with the evolution of hydrogen gas. Hydrogen gas produces a pop sound when brought near a burning matchstick.$$ X_{(s)}+\mathrm{H}_{2} \mathrm{SO}_{4(a q)} \longrightarrow X \mathrm{SO}_{4(a q)}+\mathrm{H}_{2(g)} \quad[X=	ext { Metal }] $$ Out of the given metals, only sodium is above hydrogen in the reactivity series hence only it can displace hydrogen from acids;