Q.

Molality of 10 grams of aqueous solution containing  2 grams of caustic soda is

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a

5 m

b

7.2 m

c

6.25 m

d

4.2 m

answer is C.

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Detailed Solution

Wsolute=2 g; GMW of solute=40 g; Wsolution=10 g; Wsolvent=10-2g; m=240×10008=6.25m
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