Q10 of 44 Page 1

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(i) Displacement reaction


(ii) Precipitation reaction


(iii) Combination reaction


(iv) Double displacement reaction

This reaction is a double displacement reaction as well as a precipitation reaction. This is a double displacement reaction because one component of each compound has exchanged places with each other. It is also called a precipitation reaction due to the formation of white precipitate of barium sulphate. Rest other products formed are soluble in water except barium sulphate that precipitates out.


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8

Which among the following statement (s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride.


(ii) sublimation of silver chloride.


(iii) decomposition of chlorine gas from silver chloride.

 9

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime water. Which among the following is/are true about slaking of lime water and the solution formed?

(i) It is an endothermic reaction.


(ii) It is exothermic reaction.


(iii) The pH of the resulting solution will be more than seven.


(iv)The pH of the resulting solution will be less than seven.

 11

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

 12

Which of the following is (are) an endothermic process (es)?

(i) Dilution of sulphuric acid


(ii) Sublimation of dry ice


(iii) Condensation of water vapours


(iv) Evaporation of water