JEE Main Solutions Practice Questions With Solutions

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JEE Main Chemistry Solutions Practice Questions

Question 1.

$0.05 M {CuSO}_{4}$ when treated with $0.01 M K_{2} {Cr}_{2} O_{7}$ gives green colour solution of ${Cu}_{2} {Cr}_{2} O_{7}$ . The two solutions are separated as shown below :[SPM : Semi Permeable Membrane]

JEE Main 2024 (Online) 9th April Morning Shift Chemistry - Solutions Question 7 English

Due to osmosis :

Molarity of

K_{2} {Cr}_{2} O_{7}

solution is lowered.

Green colour formation observed on side Y.

Molarity of

{CuSO}_{4}

solution is lowered.

Green colour formation observed on side X.

Question 2.

We have three aqueous solutions of

NaCl

labelled as '

A

', '

B

' and '

C

' with concentration

0.1 M

0.01 M

and

0.001 M

, respectively. The value of van 't Hoff factor(i) for these solutions will be in the order :

i_{A} < i_{C} < i_{B}

i_{A} < i_{B} < i_{C}

i_{A} > i_{B} > i_{C}

i_{A} = i_{B} = i_{C}

Question 3.

Identify the mixture that shows positive deviations from Raoult's Law

{({CH}_{3})}_{2} CO + {CS}_{2}

{({CH}_{3})}_{2} CO + C_{6} H_{5} {NH}_{2}

{CHCl}_{3} + C_{6} H_{6}

{CHCl}_{3} + {({CH}_{3})}_{2} CO

Question 4.

The solution from the following with highest depression in freezing point/lowest freezing point is

180 g

of acetic acid dissolved in benzene

180 g

of acetic acid dissolved in water

180 g

of benzoic acid dissolved in benzene

180 g

of glucose dissolved in water

Question 5.

What happens to freezing point of benzene when small quantity of napthalene is added to benzene?

Increases

Decreases

Remains unchanged

First decreases and then increases

Question 6.

A solution of two miscible liquids showing negative deviation from Raoult's law will have :

increased vapour pressure, increased boiling point

increased vapour pressure, decreased boiling point

decreased vapour pressure, decreased boiling point

decreased vapour pressure, increased boiling point

Question 7.

What weight of glucose must be dissolved in $100 g$ of water to lower the vapour pressure by $0.20 mm Hg$ ?

(Assume dilute solution is being formed)

Given : Vapour pressure of pure water is $54.2 mm Hg$ at room temperature. Molar mass of glucose is $180 g {mol}^{- 1}$

3.69 g

2.59 g

3.59 g

4.69 g

Question 8.

Evaluate the following statements for their correctness.

A. The elevation in boiling point temperature of water will be same for

0.1 M NaCl

and

0.1 M

urea.

B. Azeotropic mixtures boil without change in their composition.

C. Osmosis always takes place from hypertonic to hypotonic solution.

D. The density of

32 % H_{2} {SO}_{4}

solution having molarity

4.09 M

is approximately

1.26 g {mL}^{- 1}

E. A negatively charged sol is obtained when KI solution is added to silver nitrate solution.

Choose the correct answer from the options given below :

A, B and D only

A and C only

B and D only

B, D and E only

Question 9.

Match List I with List II

	List I		List II
A.	van't Hoff factor, i	I.	Cryoscopic constant
B.	$k_{f}$	II.	Isotonic solutions
C.	Solutions with same osmotic pressure	III.	$\frac{Normal molar mass}{Abnormal molar mass}$
D.	Azeotropes	IV.	Solutions with same composition of vapour above it

Choose the correct answer from the options given below :

A-III, B-I, C-IV, D-II

A-III, B-I, C-II, D-IV

A-III, B-II, C-I, D-IV

A-I, B-III, C-II, D-IV

Question 10.

In the depression of freezing point experiment

A. Vapour pressure of the solution is less than that of pure solvent

B. Vapour pressure of the solution is more than that of pure solvent

C. Only solute molecules solidify at the freezing point

D. Only solvent molecules solidify at the freezing point

Choose the most appropriate answer from the options given below :

A and C only

A only

A and D only

B and C only

Question 1.

Boiling point of a $2 %$ aqueous solution of a non-volatile solute A is equal to the boiling point of $8 %$ aqueous solution of a non-volatile solute B. The relation between molecular weights of A and B is

M_{A} = 4 M_{B}

M_{B} = 4 M_{A}

M_{A} = 8 M_{B}

M_{B} = 8 M_{A}

Question 2.

Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y, respectively in 1 kg of water. The ratio of depression in freezing points for A and B is found to be 1 : 4. The ratio of molar masses of X and Y is

1 : 4

1 : 0.25

1 : 0.20

1 : 5

Question 3.

The depression in freezing point observed for a formic acid solution of concentration $0.5 mL L^{- 1}$ is ${0.0405}^{\circ} C$ . Density of formic acid is $1.05 g {mL}^{- 1}$ . The Van't Hoff factor of the formic acid solution is nearly : (Given for water $k_{f} = 1.86 k kg {mol}^{- 1}$ )

0.8

1.1

1.9

2.4

Question 4.

For a solution of the gases A, B, C and D in water at 298 K, the values of Henry's law constant (K_H) are 30.40, 2.34, 1.56 $\times$ 10^{$-$ 5} and 0.513 k bar respectively. In the given graph, the lines marked as 'p' and 's' correspond respectively to :

JEE Main 2022 (Online) 30th June Morning Shift Chemistry - Solutions Question 49 English

A and C

B and A

D and A

C and D

Question 5.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : At 10 $^{\circ}$ C, the density of a 5 M solution of KCl [atomic masses of K & Cl are 39 & 35.5 g mol^{$-$ 1} respectively], is 'x' g ml^{$-$ 1}. The solution is cooled to $-$ 21 $^{\circ}$ C. The molality of the solution will remain unchanged.

Reason (R) : The molality of a solution does not change with temperature as mass remains unaffected with temperature.

In the light of the above statements, choose the correct answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

(A) is false but (R) is true.

Question 6.

Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, it depresses the freezing point by 0.2 $^{\circ}$ C. The percentage association of solute A in water, is :

[Given : Molar mass of A = 93 g mol^{$-$ 1}. Molal depression constant of water is 1.86 K kg mol^{$-$ 1}.]

50%

60%

70%

80%

Question 7.

Which one of the following 0.10 M aqueous solutions will exhibit the largest freezing point depression?

hydrazine

glucose

glycine

KHSO₄

Question 8.

Which one of the following 0.06 M aqueous solutions has lowest freezing point?

Al₂(SO₄)₃

C₆H₁₂O₆

K₂SO₄

Question 9.

A set of solutions is prepared using 180 g ofwater as a solvent and 10 g of different nonvolatile solutes A, B and C. The relativelowering of vapour pressure in the presence ofthese solutes are in the order :

[Given, molarmass of A = 100 g mol^–1; B = 200 g mol^–1;C = 10,000 g mol^–1]

A > C > B

C > B > A

A > B > C

B > C > A

Question 10.

The size of a raw mango shrinks to a muchsmaller size when kept in a concentrated saltsolution. Which one of the following processescan explain this?

Osmosis

Reverse osmosis

Diffusion

Dialysis

JEE Main Solutions Practice Questions With Solutions

JEE Main Chemistry Solutions Practice Questions

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

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