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Question

What happens when zinc granules are treated with dilute solution of H2SO4,HCI,HNO3,NaCI and NaOH? Also write the chemical equations if reaction occurs.

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Solution

The reaction of Zn granules with
(i) dilute H2SO4
Zn(s)+H2SO4(aq)ZnSO4(aq)+H2(g)
(ii) dilute HCl
Zn(s)+HCl(aq)ZnCl2(aq)+H2(g)
(iii) dilute HNO3
Reaction with dilute HNO3 is different as compared to other acids because nitric acid is an oxidising agent and it oxidises h2 gas evolved to H2O
4Zn(s)+10HNO3(aq)4Zn(NO3)2(aq)+5H2O(l)+N2O(g)
(iv) NaCl solution
Zn(s)+NaCl(aq)Noreaction
(v) NaOH solution
Zn(s)+2NaOH(aq)Na2ZnO2(aq)sodiumzincate+H2(g)

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