Question

Correct the following statements :

(a) Hydrogen is used as a fuel for rocket propulsion.

(b) All metals react with acids to give hydrogen.

(c) Metals adsorb hydrogen.

(d) Very dilute nitric acid reacts with zinc to produce hydrogen.

(e) $Conc.H_{2}S{O}_4$ reacts with zinc to liberate hydrogen.

Answer 1

(a) Hydrogen is used as a fuel in the form of coal gas, water gas and liquid hydrogen.
(b) All metals above hydrogen in reactivity series react with acids to give hydrogen.
(c) Metals like palladium or platinum or nickel absorb hydrogen at room temperature.
(d) Very dilute nitric acid reacts with zinc to produce zinc nitrate, water and nitric oxides.
(e) Concentrated sulphuric acid reacts with zinc to liberate sulphur dioxide.