Question -
Which of the following solutions in water will have the lowest vapour pressure
Options:
A .  0.1 M,NaCl
B .  0.1 M Na3 PO4
C .  0.1 M, BaCl2
D .  0.1 M, sucrose
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. MoleculeNaClNa3Po4BaCl2SucroseNo.ofionspermolecule1+1=23+1=41+2=31
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