Zinc granules give H2 gas when treated with dilute solution of:
A
H2SO4
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B
HCl
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C
NaOH
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D
all of these
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Solution
The correct option is D all of these i) Zinc reacts with dilute sulphuric acid(H2SO4) to form zinc sulphate (ZnSO4) and hydrogen(H2) gas. Zn(s)+H2SO4(aq)→ZnSO4(aq)+H2(g) ii) Zinc reacts with hydrochloric acid to form zinc chloride(ZnCl2) and hydrogen(H2) gas. Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) iii) Zinc reacts with sodium hydroxide to form sodium zincate(Na2ZnO2) and hydrogen(H2). Zn(s)+2NaOH(aq)→Na2ZnO2(aq)+H2(g)