Q34 of 152 Page 20

State the various characteristics of chemical reactions.

(a) The various characteristics of chemical reaction are as follows:

(i) Effervescence of gas.


(ii) Precipitate formation.


(iii) Colour Change.



More from this chapter

All 152 →
33 What is meant by a chemical reaction? Explain with the help of an example. 33 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.

 34 State one characteristic each of the chemical reaction which takes place when:

(i) dilute hydrochloric acid is added to sodium carbonate


(ii) lemon juice is added gradually to potassium permanganate solution


(iii) dilute sulphuric acid is added to barium chloride solution


(iv) quicklime is treated with water


(v) wax is burned in the form of a candle

 35 What do you understand by exothermic and endothermic reactions?