From among the set of metals — sodium, zinc, iron, copper, silver, select the following giving equations for each reaction :
(a) Two metals which will liberate hydrogen from water.
(b) One metal which is used to prepare hydrogen gas in the laboratory.
(c) One metal which will displace copper from copper sulphate solution.
(d) One metal which will not displace copper from copper sulphate solution.
(a) (i) $2Na + H_2O \rightarrow 2NaOH + H_2$
Sodium + Water → Sodium hydroxide + Hydrogen
(ii) $Zn + H_2O \rightarrow ZnO + H_2$
Zinc + Steam → Zinc oxide + Hydrogen
(b) $Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2$
Zinc + dil. Sulphuric acid → Zinc sulphate + Hydrogen
(c) $Fe + CuSO_4 \rightarrow FeSO_4 + Cu$
Iron + Copper sulphate → Iron sulphate + Copper
(d) $Ag + CuSO_4 \rightarrow No \ reaction$
Silver + Copper sulphate → No reaction
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