Question

Give a chemical reaction in which
a) A change in colour is observed
b) A gas is evolved
c) Sound is produced

Answer 1

This is the answer
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Answer 2

Heya!!Here is your answer friend ⤵⤵


@). A change in colour is observed when a displacement reaction takes place between CuSO4 and Fe .

CuSO4+ Fe---------FeSO4 + Cu

Here the colour of solution turns green due to the formation of ferrous sulphate.

b). A gas is evolved when An acid reacts with a metal .

HCl. +. Zn---------ZnCl + H2 ⬆

Here hydrochloric acid reacts with a. Metal i,e zinc and forms a corresponding metal salt and HYDROGEN gas is evolved.

c). Sound is produced when we add a piece of zinc granules to sulphuric acid .

Zn + H2SO4--------ZnSO4 + H2⬆

Here a sizzling sound is release due to the reaction .

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Hope it helps you ✌✌