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Question

# Which among the following has lowest vapour pressure?

A
0.5M Al2(SO4)3
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B
12% Urea solution
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C
1M NaCl(aq)
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D
18% Glucose solution
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Solution

## The correct option is A 0.5M Al2(SO4)3Vapour pressure depends on the concentration of non-volatile solute.For Al2(SO4)3, we need to consider C×i, where C=Concentrationi=VantHoffFactorHence, for Al2(SO4)3 , C×i=0.5×5=2.5For Urea solution, C=12×100060×100=2MFor NaCl solution, C×i=1×2=2For Glucose solution, C=18×1000180×100=1MHere, concentration of non-volatile solute is maximum for Al2(SO4)3. Hence, it will have lowest vapour pressure.

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