Solution Quiz 5

Question 1

The vapour pressure of water is 15.5 mm at 20 &deg;C. The lowering of vapour pressure of 0.02 m K Br solution will be

Accepted Answer

0.0112 mm Hg

Answer

0.0056 mm Hg

Answer

0.056 mm Hg

Answer

0.31 mm Hg

Question 2

Which of the following 0.1 M aqueous solutions will exert highest osmotic pressure ?

Accepted Answer

$Al_2 (SO_4 )_3$

Answer

$Na_2 SO_4$

Answer

$MgCl_2$

Answer

KCl

Question 3

If equimolar solutions of urea, NaCl, sucrose and $BaCl_2$ have boiling points A, B, C and D, then

Accepted Answer

A = C < B < D

Answer

A = D < B < C

Answer

A > B > C < D

Answer

A < B < C < D

Question 4

The molar mass of acetic acid obtained by measuring depression in freezing point is $115.8\, gmol^{-1}$ . Hence the degree of association is

Accepted Answer

0.964

Answer

0.482

Answer

0.883

Answer

1.12

Question 5

$\Delta \ T_b /m$ for NaBr solution will have value $(K_b = 0.52 \,K \,kg\, mol ^{-1}) :$

Accepted Answer

$1.04 \ K \ kg \ mol^{-1}$

Answer

$0.52 \ K \ mol^{-1}$

Answer

$0.104 \ K \ kg \ mol^{-1}$

Answer

$1.24 \ kg \ mol^{-1}$

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