correct observation .1)0.1M urea ,2) 0.1M Nacl ,3) 0.1M cacl2 a)vapour pressure of 1 is lowest b)relative lowerimg of vapour pressure is maximum in 3 c)freezing poimt is maximum for 3 d)boilimg point is minimum for

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Question 53
Assertion (A) When NaCl is added to water a depression in freezing point is observed.
Reason (R) The Lowering of vapour pressure of a solution causes depression in the freezing point.

Q. For different aqueous solutions of

0.1 N

urea, 0

.1 N N a C l, 0.1 N

N a_{2} S O_{4}

and

0.1 N N a_{2} P O_{4}

solution at

27^{o} C

, the correct statements are:
1. The order of osmotic pressure is,

N a C l > N a_{2} S O_{4} > N a_{3} P O_{4} > u r e a

.
2.

π = \frac{Δ T_{b}}{K_{b}} \times S T

for urea solution.
3. Addition of salt on ice increases its melting point.
4. Addition of salt on ice brings in melting of ice earlier.

Q. The lowering in vapour pressure is maximum for:

Q. Relative lowering of vapour pressure is maximum for:

Q. Which one of the following is the ratio of the lowering of vapour pressure of

0.1 M

aqueous solution of

B a C l_{2}, N a C l

and

A l_{2} (S O_{4})_{3}

, respectively?

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