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Relative Lowering of Vapour Pressure

Which of the ...

Question

Which of the following solutions will have the maximum lowering of vapour pressure ?

1M -

{C a C l}_{2}

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1M-

N a C l

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1N -

P h e n o l

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1M -

S u c r o s e

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Solution

The correct option is A 1M - ${C a C l}_{2}$
Since the some compounds in the options are ionic, the maximum lowering is decided as per the highest vant hoff factor.
For calcium chloride ,V.H. factor $=$ 3
For salt,V .H. factor $=$ 2
For phenol , V.H. factor < 1 (molecules associate)
For sucrose , factor $=$ 1.

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