Question

what can be its answer ?
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Answer 1

Answer:

Impromptu speeches are usually used in short informal meetings where the audience can interrupt and ask questions to help guide the speech and retrieve the information they need from the speaker.

Answer 2

Answer:

c) CaCO3 ----> CaO + CO2

Explanation:

c) CaCO3 ----> CaO + CO2

This is a decomposition reaction as the reactant(CaCO3) breaks into 2 or more parts.

As CaCO3 is seen here breaking into CaO and CO2 we can say that out of all the options this is a decomposition reaction