Solutions Test 34

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Solutions Test 34

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Weekly Quiz Competition

Question 1
1 / -0

The vapour pressure of a pure liquid solvent (X) is decreased to 0.60 atm from 0.80 atm on the addition of a non-volatile substance (Y). The mole fraction of Y in the solution is:

A
0.20

B
0.25

C
0.5

D
0.75

Solution
Question 2
1 / -0

Number of gm of oxygen in 32.2 g $$ Na_2SO_4.10H_2O $$ is

A
20.8

B
22.4

C
2.24

D
2.08
Question 3
1 / -0

One mole of calcium phosphide on reacting with excess of water gives:

A
three moles of phosphine

B
one mole of phosphoric acid

C
two moles of phosphine

D
one mole of $$ P_2O_5 $$

Solution
Question 4
1 / -0

Relative lowering in vapour pressure of a solution containing 1 mole $$K_{2}SO_{4}$$ in 54 g $$H_{2}O$$ is: ( $$K_{2}SO_{4}$$ is 100 % ionised )

A
$$\dfrac{1}{55}$$

B
$$\dfrac{3}{55}$$

C
$$\dfrac{3}{4}$$

D
$$\dfrac{1}{2}$$

Solution
Question 5
1 / -0

On mixing $$10 \mathrm { ml } \mathrm { CCl } _ { 4 }$$ and 10$$\mathrm { ml }$$ benzene, the total volume of solution is :

A
$$> 20 \mathrm { ml }$$

B
$$< 20 \mathrm { ml }$$

C
$$20 ml$$

D
Can't be predicted
Question 6
1 / -0

A solution is 20% ethanol by volume is found to have a density of 0.977 g/ml. The density of ethanol is 0.789 g/ml. The mass per cent of ethanol solution is:

A
7.89%

B
9.77%

C
16.15%

D
18.72%
Question 7
1 / -0

There are two oxides of sulphur. They contain 50% and 60% of oxygen respectively by weight. The weights of sulphur which combine with 1 gm of oxygen are in the ratio of:

A
1 ; 1

B
2 : 1

C
2 : 3

D
3 : 2

Solution
Question 8
1 / -0

$$18 g$$ glucosse $$\left( C _ { 6 } H _ { 12 } O _ { 6 } \right)$$ is added to 178.2 g water. The vapor pressure of water (in torr) for aqueous solution is

A
$$76.0$$

B
$$752.4$$

C
$$759.0$$

D
$$7.6$$
Question 9
1 / -0

The vapour pressure of acetone at $$ 20^0 C $$ is 185 torr. when 1.2 g of non-volatile substance was dissolved in 100 g of acetone at $$ 20^0 C $$, its vapour pressure was 183 torr. the molar mass (in$$g.mol^{-1}$$)of the substances is ;

A
128

B
488

C
32

D
64
Question 10
1 / -0

One mole of non-volatile solute is dissolved in two moles of water. The vapour pressure of the solution relative to that of water is:

A
$$\cfrac{2}{3}$$

B
$$\cfrac{1}{3}$$

C
$$\cfrac{1}{2}$$

D
$$\cfrac{3}{2}$$

Solution