Question

A chemical reaction is generally accompanied by certain external indications or characteristics.
These include - change of - al colour b] state c) smell d] evolution of gas
el 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 - il copper carbonate
ii] zinc carbonate ili] mercury [II] oxide iv] lead [IV] oxide,
lion​

Answer 1

Explanation:

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Answer 2

Explanation:

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