If the vapour pressure of pure solvent A is 17.5 mm and lowering of vapour pressure of solution formed by adding a non-volatile electrolyte is 0.0175 mm then what is the relative lowering of vapour pressure?

0.1

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1.01

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0.01

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0.001

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Solution

The correct option is D
0.001

Relative lowering of vapour pressure

= lowering of vapour pressure of solution/ vapour pressure of pure solvent

=0.0175/17.5=0.001

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