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ICSE Class 10 Chemistry Question 37 of 42

Practical Chemistry — Question 38

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Question 1(2020)

State one relevant observation for the following reaction : Zinc carbonate is heated strongly.

Answer

The original white colour turns yellow on heating. Colourless, odourless carbon dioxide gas is evolved.

ZnCO3⟶ZnO+CO2[Zinc[Zinc oxide][Carboncarbonate][yellow - hot]dioxide][white][white - cold]\begin{matrix} \text{ZnCO}_3 &\longrightarrow & \text{ZnO} & + & \text{CO}_2 \\ \text{[Zinc} & & \text{[Zinc oxide]} & & \text{[Carbon} \\ \text{carbonate]} & & \text{[yellow - hot]} & & \text{dioxide]} \\ \text{[white]} & & \text{[white - cold]} \end{matrix}