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Q.

To change the  molal concentration to one half, one of the following should be adopted

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a

weight of the solute should be doubled

b

weight of the solution should be doubled

c

weight of the solvent should be doubled

d

volume of the solvent should be doubled

answer is B.

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Detailed Solution

molality= n_{solute} X \frac{1}{W_{solvent}(kg)}

 

molality\propto \frac{1}{W_{solvent}}

 

 

 

when Wsolvent is doubled, molality gets halved

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