Question

A chemical reaction is generally accompanied by certain external indications or characteristics. These include - change of -a] colour b] state c] smell c] smell d] evolution of gas e] formation of precipitate f] 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. ​

Answer 1

Answer:

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