Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute `H_(2)SO_(4).`

Explanation

(a) When dilute hydrochloric acid is added ot a reactive metal, then hydrogen gas is produced.
(b) When iron reacts with dilute sulphuric acid, the iron (II) sulphate and hydrogen gas are produced. This chemical reaction can be represented by an equation as follows:
`underset ("Iron")(Fe(s)) + underset("Sulphuric acid")(H_(2)SO_(4)(aq)to underset("Iron (II) sulphate")(FeSO_(4)(aq))+underset("Hydrogen")(H_(2)(g))`