Question

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

September 15, 2024

Answer

The reaction of Zn granules with

(i) dilute H₂SO₄

Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g)

(ii) dilute HCL

Zn(s) + 2HCL(aq) → ZnCL₂(aq) + H₂(g)

(iii) dilute HNO₃

Reaction with dilute HNO₃is 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) → No reaction

(v) NaOH solution

𝑍𝑛(𝑠) + 2𝑁𝑎𝑂𝐻(𝑎𝑞) → 𝑁𝑎₂𝑍𝑛𝑂₂(𝑎𝑞) + 𝐻2(𝑔)

. 𝑠𝑜𝑑𝑖𝑢𝑚 𝑧𝑖𝑛𝑐𝑎𝑡𝑒

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