Q42 of 270 Page 68

The indicator which produces a pink colour in an alkaline solution is:

Phenolphthalein is colourless in nature. It turns into pink colour when added to an alkaline solution.

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40 The discomfort caused by indigestion due to overeating can be cured by taking: 41 The property which is common between vinegar and curd is that they: 43 A solution reacts with zinc granules to give a gas which burns with a 'pop' sound. The solution contains 44 When a piece of limestone reacts with dilute HO, a gas X is produced. When gas X is passed through water then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolve forming a soluble compound Z.

(a) What are X, Y and Z?


(b) Write equations for the reactions which take place:


(i) when limestone reacts with dilute HCl


(ii) when gas X reacts with lime water to form white precipitate Y


(iii) when excess of gas X dissolves white precipitate Y to form a soluble compound Z