Write the chemical equation for the preparation of hydrogen using zinc metal with:
(i) Water
(ii) Acid
(iii) Alkali
Answers
The chemical equation for preparation of hydrogen using zinc metal with above reagents is given as:--
(i) With water-- Zinc reacts with water to give zinc oxide which is a solid compound along with evolution of hydrogen gas. The reaction is :--
Zn(s) + H2O(l)--------> ZnO(s) + H2(g)
(ii)With acid--Zinc reacts with acids like hydrochloric acid or sulphuric acid to produce hydrogen gas. With hydrochloric acid we get zinc chloride along with hydrogen gas. Reaction is:--
Zn(s) + 2HCl-------->ZnCl2 + H2(g)
Zinc with sulphuric acid gives zinc sulphate along with evolution of hydrogen gas.
Zn(s) + H2SO4-------->ZnSO4 + H2(g)
(iii) Zinc reacts with alkali like NaOH and KOH to give hydrogen gas with is characterized by bubbles and popping sound. The reaction of zinc with NaOH is given as :--
Zn(s) + NaOH--------->Na2ZnO2 +H2(g)
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