Solutions Test 4

Question 1
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Only One Option Correct Type
This section contains 11 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct
An unopened soda has an aqueous concentration of C02 at 25° C equal to 0.0506 molal. Thus, pressure of C0₂ gas in the can is (K_H = 0.034 mol/kg bar)

A
0.671 bar

B
1.49 bar

C
1.20 bar

D
1.71 bar

Question 2
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CO(g)is dissolved in H₂Oat 25°C and 0.010 atm. Henry’s law constant for this system is 5.80 x10⁴ atm. Thus, mole fraction of CO(g)is

A
1.72 x 10^-7

B
8.28 x 10^-7

C
0.99

D
0.01

Question 3
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H₂S gas is used in qualitative analysis of inorganic cations. Its solubility in water at STP is 0.195 mol kg^-1. Thus, Henry’s law constant (in atm molar^-1) for H₂S is

A
0.195

B
5.128

C
3.897 x 10³

D
2.565 x 10^-4

Question 4
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Variation of K_h (Henry’s law constant) with temperature T is shown by following graphs I - IV.

Correct representation is

A
I

B
II

C
III

D
IV

Question 5
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Concentration of C0₂ (in mole fraction) in fat when partial pressure of C0₂ is 55 kPa at 25° C, is (Henry’s law constant of C0₂ = 8.6 x 10⁴ torr)

A
1.6 x 10^-4

B
4.8 x 10^-3

C
8.6 x 10^-4

D
2.4 x 10^-3

Question 6
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What is the concentration of 0₂ in a fresh water stream in equilibrium with air at 25° C and 1.0 bar? Given, K_H (Henry’s law constant) of 0₂ = 1.3 x 10^-3 mol/kg bar at 25° C.

A
8.736 x 10^-3 g/kg

B
4.16 x 10^-2g/kg

C
24.04 g/kg

D
114.5 g/kg

Question 7
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Following data has been given for C0₂ for the concentration in H₂0.
If solution of C0₂ in H₂0 is heated from 273 to 333 K, pressure ( p₂ ) needed to keep C0₂ in the solution is

A
0.108 atm

B
0.805 atm

C
0.212 atm

D
0.468 atm

Question 8
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Relation between the volume of gas (2) that dissolves in a fixed volume of solvent(1) and the partial pressure of gas (2) is (n_t = total moles, K₁and K₂ are Henry’s constants)

A
n_tRT/K₂

B
n₂RT/K₂p₂

C
n₁RT/n₂

D
None of these

Question 9
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Which is correct about Henry's law

A
The gas in contact with the liquid should behave as an ideal gas

B
There should not be any chemical interaction between the gas and liquid

C
The pressure applied should be high

D
All of these

Question 10
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Henry’s law constant for N₂ at 293 K is 76.48 kbar. N₂ exerts a partial pressure of 0.987 bar. If N₂ gas is bubbled through water at 293 K, then number of millimoles of N₂ that will dissolve in 1 L of water is

A
0.0716

B
1.29 x 10^-5

C
1.29 x 10^-2

D
5.55

Question 11
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A handbook lists the solubility of carbon monoxide in water at 0° C and 1 atm pressure as 0.0354 mL CO per mL of H₂0. What should be the pressure of CO(g) above the solution to obtain 0.010 M CO solution?

A
0.633 atm

B
6.33 atm

C
1 atm

D
0.01 atm

Question 12
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Statement I: People living at high altitudes have symptoms of a condition known as anoxia.
Statement II: At high altitudes, the partial pressure of oxygen is less than that at the ground level.

A
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

B
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Question 13
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Statement! Soft drinks and soda water (carbonated water) bottles are sealed under high pressure.
Statement II Solubility of C0₂ increases under high pressure.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Question 14
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Statement I Scuba (instrum ent used for breathing) divers must cope with high concentration of dissolved gases while breathing at high pressure under water.
Statement II Formation of bubbles in blood blocks capillaries and creates bends which are painful and dangerous to life.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Question 15
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Matching List Type
Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct

The major components of air are 0₂ and N₂ with approximate proportion of 21% and 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 K, K_H(N₂ ) = 6.5 1 x 10⁷ mm, K_H( 0₂ ) = 3.30 x 10⁷ mm Match the parameters in Column I with their values in Column II and select the answer from the codes given below.
Codes:

A
a

B
b

C
c

D
d

Question 16
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The value for Henry’s constant for helium, hydrogen, nitrogen and oxygen at 293 K are 144.97 kbar, 69.16 kbar, 76.48 kbar and 34.86 kbar respectively. Which of the gas will be having maximum solubility?

A
Hydrogen

B
Oxygen

C
Helium

D
Nitrogen

Question 17
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A solution in which no more solute can be dissolved at a given temperature and pressure is called a saturated solution. At saturated solution stage equilibrium gets established among which two processes?

A
Dissolution and crystallisation

B
Dissolution and condensation

C
Sublimation and crystallisation

D
Evaporation and condensation

Question 18
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A solution in which no more solute can be dissolved at the given temperature and pressure is called a

A
Unsaturated solution

B
Dilute solution

C
Solid solution

D
Saturated solution

Question 19
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Which expression correctly represents Henry’s Law?

A

B

C

D

Question 20
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Value of Henry’s constant KH is ______.

A
Increases with increase in temperature

B
Decreases with increase in temperature

C
Remains constant

D
First increases, then decreases

Question 21
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Some solute particles in solution collide with other solid solute particles present and get separated out of solution. This process is known as

A
Condensation

B
Dissolution

C
Sublimation

D
Crystalisation

Question 22
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The value for Henry’s constant for argon, carbon dioxide, methane and vinyl chloride at 298 K are 40.3 kbar, 1.67 kbar, 0.413 kbar and 0.611 kbar respectively. Which of the gas will be having least solubility?

A
Argon

B
Vinyl chloride

C
Methane

D
Carbon dioxide

Question 23
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Which of the following gases will be least soluble in water?

A
Hydrogen chloride

B
Sulphur dioxide

C
Ammonia

D
Nitrogen

Question 24
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According to Henry’s Law at a constant temperature the solubility of gas in a liquid is directly proportional to the

A
Mass of gas

B
Density of gas

C
Volume of gas

D
Pressure of gas

Question 25
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When a large amount of solute dissolves in a given amount of solvent it forms

A
Dilute solution

B
Saturated solution

C
Aqueous solution

D
Concentrated solution

Submit Test

Solutions Test ...

Question 1

0.671 bar

1.49 bar

1.20 bar

1.71 bar

Question 2

1.72 x 10-7

8.28 x 10-7

0.99

0.01

Question 3

0.195

5.128

3.897 x 103

2.565 x 10-4

Question 4

I

II

III

IV

Question 5

1.6 x 10-4

4.8 x 10-3

8.6 x 10-4

2.4 x 10-3

Question 6

8.736 x 10-3 g/kg

4.16 x 10-2 g/kg

24.04 g/kg

114.5 g/kg

Question 7

0.108 atm

0.805 atm

0.212 atm

0.468 atm

Question 8

ntRT/K2

n2RT/K2p2

n1RT/n2

None of these

Question 9

The gas in contact with the liquid should behave as an ideal gas

There should not be any chemical interaction between the gas and liquid

The pressure applied should be high

All of these

Question 10

0.0716

1.29 x 10-5

1.29 x 10-2

5.55

Question 11

0.633 atm

6.33 atm

1 atm

0.01 atm

Question 12

Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

Statement I is correct but Statement II is incorrect

Statement II is correct but Statement I is incorrect

Question 13

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

Statement I is correct but Statement II is incorrect

Statement II is correct but Statement I is incorrect

Question 14

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

Statement I is correct but Statement II is incorrect

Statement II is correct but Statement I is incorrect

Question 15

a

b

c

d

Question 16

Hydrogen

Oxygen

Helium

1.72 x 10^-7

8.28 x 10^-7

3.897 x 10³

2.565 x 10^-4

1.6 x 10^-4

4.8 x 10^-3

8.6 x 10^-4

2.4 x 10^-3

8.736 x 10^-3 g/kg

4.16 x 10^-2g/kg

n_tRT/K₂

n₂RT/K₂p₂

n₁RT/n₂

1.29 x 10^-5

1.29 x 10^-2