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Which of the following solutions in water will have the lowest vapour pressure

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Which of the following solutions in water will have the lowest vapour pressure
A. 0.1 M, NaCl
B. 0.1 M, Sucrose
C. `0.1 M, BaCl_(2)`
D. `0.1 M Na_(3)PO_(4)`
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Correct Answer - D
`Na_(3)PO_(4)` consist of maximum ions hence it show lowest vapour pressure.
`Na_(3)PO_(4)to 3Na^(+)+PO_(4)^(3-)=4` ion.
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