Give an example for each of a change that involves:
(a) change in colour,
(b) evolution of a gas and
(c) production of sound

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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.

Question 20

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.

Question 3

A chemical change may involve
(a) change in colour only
(b) change in temperature only
(c) evolution of gas only
(d) All of the these

Q. Give one example each of a chemical reaction characterised by:
(a) evolution of a gas
(b) formation of a precipitate
(c) change in temperature
Write equations of the reactions which take place in each case.

Give an example of each of the following chemical changes.

(a) A reaction involving.

(i) Change of state.

(ii) Formation of the precipitate.

(b) An exothermic and an endothermic reaction involving carbon as one of the reactants.

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Give an example for each of a change that involves: (a) change in colour, (b) evolution of a gas and (c) production of sound​

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Give an example for each of a change that involves:
(a) change in colour,
(b) evolution of a gas and
(c) production of sound