A chemical reaction is generally accompanied by certain external indic

1.	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 gasel formation of precipitate f] evolution or absorption of heat. With reference to change ofcolour - state the change in colour seen when the following are heated - il copper carbonateii] zinc carbonate ili] mercury [II] oxide iv] lead [IV] oxide,lion
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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 gasel formation of precipitate f] evolution or absorption of heat. With reference to change ofcolour - state the change in colour seen when the following are heated - il copper carbonateii] zinc carbonate ili] mercury [II] oxide iv] lead [IV] oxide,lion

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