During calcination, zinc carbonate decomposes to release gas.

oxygen

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carbon dioxide

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hydrogen

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Solution

The correct option is B carbon dioxide
During the calcination process, zinc carbonate decomposes to form zinc oxide and carbon dioxide. The reaction involved is:
${ZnCO}_{3} (s) Heat \to ZnO (s) + {CO}_{2} (g)$

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A l_{2} O_{3} . 2 H_{2} O C a l c i n a t i o n - ------ \to B + 2 H_{2} O

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A l_{2} O_{3} . 2 H_{2} O C a l c i n a t i o n - ------ \to B + 2 H_{2} O

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Question 55
Give the reaction involved during extraction of zinc from its ore by

(a) roasting of zinc ore.
(b) calcination of zinc ore.

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