(a)Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
(b)Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
(a) Magnesium reacts with very dilute nitric acid to form magnesium nitrate and hydrogen gas.
The equation of the reaction is given as :
$Mg(s) + 2HNO_3(aq) → Mg(NO_3)_2(aq) + H_2(g)$
(b) Magnesium and aluminium are the two metals that can displace hydrogen from dilute hydrochloric acid.
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