Question

3. A chemical reaction is generally accompanied by certain external indications or characteristics
These include - change of - al colour bl state c) smell d] evolution of gas
el formation of precipitate fl evolution or absorption of heat. With reference to change of
colour - state the change in colour seen when the following are heated - i] copper carbonate
ii) zinc carbonate iii mercury [II] oxide iv] lead [IV] oxide.
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Answer 1

Answer:

zinc carbonate or mercury

Explanation:

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