Chemistry Crash Course JEE Main>Chapter 22 - Solutions>Level 2>Q 2

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A solution containing $8.0 g$ of nicotine in $92 g$ of water freezes $0.925$ degrees below the normal freezing point of water. If the molal freezing point depression constant, $K_{f} = 1.85 ° C {mol}^{- 1}$ , then the molar mass of nicotine is:

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Important Questions on Solutions

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Chemistry Crash Course JEE Main>Chapter 22 - Solutions>Level 2>Q 3

Which solution will have the highest boiling point?

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Chemistry Crash Course JEE Main>Chapter 22 - Solutions>Level 2>Q 4

Which one of the following statements is false?

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Chemistry Crash Course JEE Main>Chapter 22 - Solutions>Level 2>Q 5

2.56 g

of sulphur in

100 g

of

{CS}_{2}

has depression in freezing point

0.010 ° C, K_{f} = 0.1 ° C {molal}^{- 1} .

Hence, atomicity of sulphur in

{CS}_{2}

is

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Chemistry Crash Course JEE Main>Chapter 22 - Solutions>Level 2>Q 6

If vapour pressures of pure liquids '

A

' and '

B

' are

300

and

800 torr

respectively at

25 ° C

. When these two liquids are mixed at this temperature to form a solution in which mole percentage of '

B

' is

92

, then the total vapour pressure is observed to be

0.95 atm

. Which of the following is true for this solution?

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Chemistry Crash Course JEE Main>Chapter 22 - Solutions>Level 2>Q 7

In what ratio of volumes $0.4 M HCl$ and $0.9 M HCl$ are to be mixed such that the concentration of the resultant solution becomes $0.7 M$ ?

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Chemistry Crash Course JEE Main>Chapter 22 - Solutions>Level 2>Q 8

K_{H}

of

N_{2}

is

1 \times 10^{5} atm

. How many moles of

N_{2}

are dissolved in

10 mol

water (pressure of air is

5 atm

and mole fraction of

N_{2}

in air is

0.8

)?

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Chemistry Crash Course JEE Main>Chapter 22 - Solutions>Level 2>Q 9

What is the mole ratio of benzene

(P_{B}^{0} = 150 torr)

and toluene

(P_{T}^{0} = 50 torr)

in vapour phase if the given solution has a vapour pressure of

120 torr ?

HARD

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 22 - Solutions>Level 2>Q 10

The vapour pressure of pure liquid

A

is

10 torr

and at the same temperature when

1 g

of

B

solid is dissolved in

20 g

of

A

, its vapour pressure is reduced to

9.0 torr

. If the molecular mass of

A

is

200 amu

, then the molecular mass of

B

is: