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Relative Lowering of Vapour Pressure

Which of the ...

Question

Which of the following solution in water possesses the lowest vapour pressure:

A

0.1 M NaCl

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B

0.1 N BaCl₂

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C

0.1 M KCl

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D

None of these

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Solution

The correct option is B
0.1 N BaCl₂

BaCl₂ gives maximum number of ions hence it shows lowest vapour pressure.

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