Give one example each of which illustrates the following characteristics of a chemical reaction:

(a) Evolution of a gas
(b) Change of colour

Q.

Give 1 example which illustrates the following characteristics of a chemical reaction

(I) evolution of gas

(II) change of colour

Q. Give one example of each which illustrates the following characteristics of a chemical reaction: ​

(a) Evolution of gas​

Q. Give one example of each which illustrates the following characteristics of a chemical reaction: ​

(c) Change in state

Q. (a) What is meant by 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.

Q. Give an example of a chemical reaction for each of the following situations:​

(a) A change in colour is observed.​
(b) A gas is evolved.
(c) Sound is produced.