Q43 of 270 Page 68

A solution reacts with zinc granules to give a gas which burns with a 'pop' sound. The solution contains

HCl, When HCl reacts with zinc granules, it releases hydrogen gas which produces ‘pop’ sound.

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41 The property which is common between vinegar and curd is that they: 42 The indicator which produces a pink colour in an alkaline solution is: 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

 45 If someone is suffering from the problem of acidity after overeating, which of the following would y suggest as remedy?

Lemon juice, Vinegar, Baking soda solution


Give reason for your choice.