Which of the following solutions in water will have the lowest vapour pressure Options: A . &nbsp 0.1 M , N a C l B . &nbsp 0.1 M N a 3 P O 4 C . &nbsp 0.1 M , B a C l 2 D . &nbsp 0.1 M , s u c r o s e

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

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Question -

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

Options:

A .

0.1 M, N a C l

B .

0.1 M N a_{3} P O_{4}

C .

0.1 M, B a C l_{2}

D .

0.1 M, s u c r o s e

Answer: Option B
:
B

Depression in vapor pressure is a colligative property. More the no. of particles present in the solution lower will be the vapor pressure. consists of maximum ions hence it show lowest vapour pressure.
$\begin{matrix} M o l e c u l e & N a C l & N a_{3} P o_{4} & B a C l_{2} & S u c r o s e N o . o f i o n s p e r m o l e c u l e & 1 + 1 = 2 & 3 + 1 = 4 & 1 + 2 = 3 & 1 \end{matrix}$

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