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2. Is Matter Around us Pure
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Q38 of 252 Page 80

9.72 g of potassium chloride dissolves in 30 g of water at 70°C. Calculate the solubility of potassium chloride at that temperature.

9.72g of KCl dissolves in 30g of water

So amount of KCl which gets dissolved in 100gm of water=9.72x100/30=32.4


The solubility of potassium chloride is 32.4 at 70C.


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36

What will happen if a saturated solution is : (i) heated, and (ii) cooled?

37

21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride at that temperature.

39

Classify the following as physical or chemical changes:

(i) Cooking of food


(ii) Boiling of water


(iii) Cutting of trees


(iv) Dissolving salt in water


(v) Digestion of food


(vi) Melting of ice

40

Which of the following are physical changes and which are chemical changes?

(a) Burning of a magnesium wire


(b) Freezing of water


(c) Rusting of iron


(d) Glowing of an electric bulb

Questions · 252
2. Is Matter Around us Pure
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