Question

(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?

Answer 1

Answer:

a)H2SO4 + Zn ---> ZnSO4 + H2

b) Two metals other than it are Al(aluminium) and Ca (calcium)

Explanation:

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Answer 2

(a) When magnesium reacts with aqueous nitric acid, there will be the displacement of hydrogen and it will form hydrogen gas and magnesium nitrate.

$M g(s)+2 H N O_{3}(a q) \rightarrow M g\left(N O_{3}\right)_{2}(a q)+H_{2}(g)$

$Magnesium Nitric acid Magnesium Nitrate Hydrogen$

(b) Aluminium and magnesium can displace hydrogen from dilute hydrochloric acid.

Explanation:

As per the series of reactivity:

• There will be a decrease in reactivity to Right from Left:
• Potassium -> Sodium -> Lithium -> Calcium ->Magnesium -> Aluminium -> Copper -> Zinc -> Ferrous -> Tin (Sn) -> Lead (Pb) -> Hydrogen -> Copper -> Mercury -> Silver -> Gold  

• This shows that when a metal reacts with other metals, there will be a displacement reaction or displacement from their solution.