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Question

When two moles of a non-volatile solute are dissolved in three moles of a solvent, the vapour pressure of the solution relative to that of the pure solvent is:

A
35
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B
25
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C
53
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D
52
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Solution

The correct option is A 35
We know,

ppp=nsolute(nsolute+nsolvent)

The vapour pressure of the solution relative to that of the pure solvent

pp=nsolute(nsolute+nsolvent)

Therefore,

pp=35

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