1.

(a) What is meant by a chemical reaction ? Explain with the help of an example. (b) Give one example each of a chemical reaction characterised by : (i) evolution of a gas (ii) change in colour (iii) formation of a precipitate (iv) change in temperature (v) change in state.

Answer»

(a) What is meant by a chemical reaction ? Explain with the help of an example.

(b) Give one example each of a chemical reaction characterised by :
(i) evolution of a gas

(ii) change in colour

(iii) formation of a precipitate

(iv) change in temperature

(v) change in state.



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