Chemistry Crash Course NEET>Chapter 8 - Solutions>Level 2>Q 32

MEDIUM

NEET

IMPORTANT

Earn 100

The vapour pressure of benzene at $80^{0} C$ is lowered by $10 mm$ by dissolving $2 g$ of a non- volatile substance in $78 g$ of benzene. The vapour pressure of pure benzene at $80^{0} C$ is $250 mm$ . The molecular mass of the substance will be_____ $g {mol}^{- 1}$ .

100% studentsanswered this correctly

Important Questions on Solutions

MEDIUM

NEET

IMPORTANT

Chemistry Crash Course NEET>Chapter 8 - Solutions>Level 2>Q 33

The vapour pressure of water at

20^{0} C

is

17.54 mm

. When

20 g

of a non-ionic, substance is dissolved in

100 g

of water, the vapour pressure is lowered by

0.30 mm

. What is the molecular weight of the substance?

MEDIUM

NEET

IMPORTANT

Chemistry Crash Course NEET>Chapter 8 - Solutions>Level 2>Q 34

Which of the following will have the highest boiling point at

1 atm

pressure?

EASY

NEET

IMPORTANT

Chemistry Crash Course NEET>Chapter 8 - Solutions>Level 2>Q 35

The molal boiling point constant for water is

0 . 513^{0} C kg / mol

. When

0.1

mole of sugar is dissolved in

200 mL

of water, the solution boils under a pressure of

1 atm

at______.

EASY

NEET

IMPORTANT

Chemistry Crash Course NEET>Chapter 8 - Solutions>Level 2>Q 36

The value of

K_{b}

for a solvent is

X K kg {mol}^{-1} . A 0.2 m

solution of a non-electrolyte in this solvent will boil at______. (Given: The boiling point of the solvent =

A^{0} C

).

EASY

NEET

IMPORTANT

Chemistry Crash Course NEET>Chapter 8 - Solutions>Level 2>Q 37

0.1

molal aqueous solution of glucose boils at

100 . 16^{0} C

. The boiling point of

0.5

molal aqueous solution of glucose will be______.

EASY

NEET

IMPORTANT

Chemistry Crash Course NEET>Chapter 8 - Solutions>Level 2>Q 38

When

10 g

of a non-volatile solute is dissolved in

100 g

of benzene, it raises the boiling point by

1^{o} C

. Then, the molecular mass of the solute is______. (

K_{b} {for benzene = 2.53 K m}^{-1}

).

MEDIUM

NEET

IMPORTANT

Chemistry Crash Course NEET>Chapter 8 - Solutions>Level 2>Q 39

The boiling point of chloroform was raised by

0.323 K

when

0.5143 g

of anthracene was dissolved in

35 g

of chloroform. The molecular mass of anthracene is______. (

K_{b} of {CHCl}_{3} = 3 .9 K kg {mol}^{- 1}

)

MEDIUM

NEET

IMPORTANT

Chemistry Crash Course NEET>Chapter 8 - Solutions>Level 2>Q 40

Elevation of the boiling point was

0 . 52^{0} C

when

6 g

of a compound '

X

' was dissolved in

100 {g of H}_{2} O

. The molar mass of '

X

' is ______

{g mol}^{-1}

.
(

K_{b}

of water is

0 . 52^{0} C

per

1000 g

of water)