Solutions Test -20

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Solutions Test -20

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Question 1
1 / -0

Osmotic pressure is a

A
Property of solution.

B
colligative property

C
property of a non-ideal solution

D
property of an ideal solution
Question 2
1 / -0

When a non-volatile solute is added to a volatile solvent, there is

A
an increase in freezing point

B
a decrease in boiling point

C
an increase in vapour pressure

D
an increase in boiling point
Question 3
1 / -0

20% ethanol by mass means

A
20 gm of ethanol is disolved in 80gm of solvent

B
20 gm of ethanol is disolved in 80gm of water

C
20 gm of ethanol is disolved 100gm of solvent

D
1000 ml of solution contains 20 gm of ethanol
Question 4
1 / -0

The colligative property depends upon

A
the mole fraction of solute

B
the mole fraction of solvent

C
the nass of solution

D
the mass of solvent
Question 5
1 / -0

Raoult's law is for

A
a gas-liquid solution

B
a liquid-liquid solution

C
for all type of solutions

D
a liquid-liquid and solid-liquid solution
Question 6
1 / -0

A solution of sodium and mercury is

A
an ideal solution

B
a non-ideal solution

C
a binary mixture

D
an amalgam
Question 7
1 / -0

If a solution contains n components, sum of mole fractions of all the components is equal to

A
n

B
1

C
2 n

D
nxn
Question 8
1 / -0

What is a homogeneous mixture

A
binary solution

B
components are in the same phase

C
mixture of a gas and liquid

D
a solution containing more than two components
Question 9
1 / -0

In an ideal solution,

A
A-A interactions are equal to B-B interactions

B
A-A and B-B interactions are equal to A-B anteractions

C
A-A and B-B interactions are less than A-B interactions

D
A-A and B-B interactions are more than A-B interactions
Question 10
1 / -0

When a non-volatile solute is added in a volatile solvent

A
vapour pressure decreases

B
vapour pressure increases

C
vapour pressure is not affected

D
vapour pressure first decreases then increases
Question 11
1 / -0

At high altitudes, the climbers suffer from

A
anaemia

B
hypertension

C
blood pressure

D
anoxia
Question 12
1 / -0

Crystallisation is possible only in

A
a saturated solution

B
a binary mixture

C
an unsaturated solution

D
the solution of solute and solvent are in equal amount
Question 13
1 / -0

30% by volume of solution of glucose means

A
30 g of glucose is disolved in 100ml. of water

B
30 ml of glucose is mixed in 1000 ml. of water

C
30 ml of glucose is disolved in water so that the total volume is 100 ml.

D
30 ml of glucose is mixed with 70 ml. of water
Question 14
1 / -0

Henry's law is for

A
a solution of a gas in a gas

B
a solution of a gas in a liquid

C
a solution of a liquid in a liquid

D
a solution of a solid in a liquid
Question 15
1 / -0

The dissolution of a gas in a liquid is

A
an andothermic process

B
an exothermic process

C
an equillibrium process

D
a process in which volume remains constant
Question 16
1 / -0

The value of Henry's constant depends upon the

A
partial pressure

B
mole fraction

C
nature of the gas

D
pressure of the solution
Question 17
1 / -0

___________ are examples of ideal solution.

A
n-hexane and n-heptane

B
Ethanol and water

C
Carbon dioxide and water

D
Milk and water
Question 18
1 / -0

Azeotropes are of

A
two types

B
three types

C
four types

D
five types
Question 19
1 / -0

The molal depression constant can also be called

A
rydberg constant

B
cryoscopic constant

C
depression constant

D
elevation constant
Question 20
1 / -0

Solubility of a substance is defined as

A
the maximum amount of that substance that can be dissolved in a specified amount of solvent

B
the minimum amount of that substance that can be dissolved in a specified amount of a solvent

C
the maximum amount of that substance that can be dissolved in a minimum amount of a solvent

D
the minimum amount of a solvent into which it can be dissolved
Question 21
1 / -0

The molal elevation constant can also be called

A
ebullioscopic constant

B
cryoscopic constant

C
elevation constant

D
rydberg constant
Question 22
1 / -0

The solubility of a liquid in a liquid

A
increases with increase in pressure

B
decreases with increase in pressure

C
always increase with increase in temperature

D
is not affected by pressure
Question 23
1 / -0

Solubility of a gas in a liquid

A
decreases with increase in temperature

B
increases with increase in temperature

C
is not affected by temperature

D
increases with decrease in pressure
Question 24
1 / -0

Ethanol disolves in water because

A
ethanol donates proton to water

B
it is an acid base reaction

C
they form hydrogen bonding

D
ethanol gets ionised in water
Question 25
1 / -0

A non-ideal solution shows

A
only negative deviation from Rault's law

B
only positive deviation from Rault's law

C
both positive and negative deviation from Rault's law

D
no deviation from Rault's law
Question 26
1 / -0

Vant Hoff factor for a dilute solution of glucose is:

A
$$0$$

B
$$1$$

C
$$1.5$$

D
$$2$$

Solution

Solution of glucose is a non-electrolytic solution.
For a non-electrolytic solution, vant hoff factor is 1.

Hence, the correct option is $$\text{B}$$
Question 27
1 / -0

The vapour pressure (V.P.) of a dilute solution of non-volatile solute is P and the V.P. of pure solvent is $$P^0$$, the lowering of the V.P. is :

A
$$+ve$$

B
$$-ve$$

C
$$P/P^0$$

D
$$P^0/P$$

Solution

The vapour pressure (V.P.) of a dilute solution of non-volatile solute is P and the V.P. of pure solvent is $$P_0$$, the lowering of the V.P. is +ve.Lowering of vapor pressure is always positive.
Question 28
1 / -0

Which substance does NOT dissolve well in water?

A
$${NH}_{3}$$

B
$${C}_{4}{H}_{10}$$

C
$${C}_{12}{H}_{22}{O}_{11}$$

D
$${H}_{2}{SO}_{4}$$

Solution

we all know, "Like dissolve like"
water is a polar solvent and $$C_4H_{10}$$ is non-polar in nature
so, it is insoluble in water.
Question 29
1 / -0

If a solute under goes dimerization and trimerization, the minimum values of the vant Hoff factors are:

A
0.50 and 1.50

B
1.50 and 1.33

C
0.50 and 0.33

D
0.25 and 0.67

Solution

$$2A\rightarrow A_{2}$$ [2 mole of A-associate to form 1]
Vant hoff factor $$=\dfrac{1}{2}=0.5$$
$$3A\rightarrow A_{3}$$
Vant hoff factor $$=\dfrac{1}{3}=0.33$$

Hence, the correct option is $$C$$
Question 30
1 / -0

Which condition is not satisfied by an ideal solution?

A
$${\Delta}_{mix}H=0$$

B
$${\Delta}_{mix}V=0$$

C
$${\Delta}_{mix}S=0$$

D
Obeyance of Raoult's law

Solution

For an ideal solution
$${\Delta}_{mixing}H=0;{\Delta}_{mixing}V=0$$
and it should obey Raoult's law.
Question 31
1 / -0

Aqueous solution of glucose was prepared by dissolving $$18g$$ of glucose in $$90g$$ of water. The relative lowering of vapour pressure is equal to

A
$$1.1$$

B
$$0.0196$$

C
$$20$$

D
$$196$$

Solution

By Raoult's law:
Relative lowering of vapour pressure
$$=\cfrac { \cfrac { w }{ m } }{ \cfrac { w }{ m } +\cfrac { W }{ M } } =\cfrac { 18/180 }{ \cfrac { 18 }{ 180 } +\cfrac { 90 }{ 18 } } $$
$$=0.0196$$
Question 32
1 / -0

Identify which of the following statements is FALSE.

A
The vapor pressure of a liquid decreases with increasing atmospheric pressure.

B
The value of an equilibrium constant is dependent on temperature.

C
The rate of a spontaneous reaction cannot be determined solely by its Gibbs free energy.

D
During a phase transition, the temperature of a substance must be constant.

Solution

During phase transition, temperature is taken on the x-axis of the phase transition curve,
hence, during phase transition the temperature of substance changes.
Question 33
1 / -0

A concentrated solution contains high amount of ________.

A
solvent

B
solute

C
both solute and solvent

D
none of these

Solution

A concentrated solution contains the maximum amount of solute that can be dissolved because solubility depends on temperature, a solution that is concentrated at one temperature may not be concentrated at a higher temperature.
Question 34
1 / -0

Which substance has a higher solubility in cold water and a lower solubility in hot water?

A
$$LiCl$$

B
$$Ca{(OH)}_{2}$$

C
$${CO}_{2}$$

D
$${C}_{6}{H}_{12}{O}_{6}$$

Solution

For gaseous solute, the solubility of gas-particle decreases with an increase in temperature.
Therefore, $$CO_2$$ is more soluble in cold water and less soluble in hot water.
Question 35
1 / -0

100 mL of liquid A and 25 mL of liquid B are mixed to formal solution of volume 125 mL. Then the solution is___________.

A
ideal

B
non-ideal with positive deviation

C
non-ideal with negative deviation

D
cannot be predicted

Solution

As change in volume $$(\Delta V)$$ is zero so the solution is ideal.

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Solutions Test -20

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Question 1

Property of solution.

colligative property

property of a non-ideal solution

property of an ideal solution

Question 2

an increase in freezing point

a decrease in boiling point

an increase in vapour pressure

an increase in boiling point

Question 3

20 gm of ethanol is disolved in 80gm of solvent

20 gm of ethanol is disolved in 80gm of water

20 gm of ethanol is disolved 100gm of solvent

1000 ml of solution contains 20 gm of ethanol

Question 4

the mole fraction of solute

the mole fraction of solvent

the nass of solution

the mass of solvent

Question 5

a gas-liquid solution

a liquid-liquid solution

for all type of solutions

a liquid-liquid and solid-liquid solution

Question 6

an ideal solution

a non-ideal solution

a binary mixture

an amalgam

Question 7

n

1

2 n

nxn

Question 8

binary solution

components are in the same phase

mixture of a gas and liquid

a solution containing more than two components

Question 9

A-A interactions are equal to B-B interactions

A-A and B-B interactions are equal to A-B anteractions

A-A and B-B interactions are less than A-B interactions

A-A and B-B interactions are more than A-B interactions

Question 10

vapour pressure decreases

vapour pressure increases

vapour pressure is not affected

vapour pressure first decreases then increases

Question 11

anaemia

hypertension

blood pressure

anoxia

Question 12

a saturated solution

a binary mixture

an unsaturated solution

the solution of solute and solvent are in equal amount

Question 13

30 g of glucose is disolved in 100ml. of water

30 ml of glucose is mixed in 1000 ml. of water

30 ml of glucose is disolved in water so that the total volume is 100 ml.

30 ml of glucose is mixed with 70 ml. of water

Question 14

a solution of a gas in a gas

a solution of a gas in a liquid

a solution of a liquid in a liquid

a solution of a solid in a liquid

Question 15

an andothermic process