Solutions · JEE Main previous year questions

115 questions asked across 16 exam years, newest first

Year-wise papers Topic-wise questions

Practise this topic

2023 18 questions

Q862023 · 13 Apr 2023 · Shift 1· Numerical answer
Solution of $12 g$ of non-electrolyte (A) prepared by dissolving it in $1000 mL$ of water exerts the same osmotic pressure as that of $0.05 M$ glucose solution at the same temperature. The empirical formula of A is $CH_{2} O$ . The molecular mass of A is ___________ g. (Nearest integer)
Show answer
Answer: 240
Q862023 · 13 Apr 2023 · Shift 2· Numerical answer
Sea water contains $29.25%$ $NaCl$ and $19%$ $MgCl_{2}$ by weight of solution. The normal boiling point of the sea water is ___________ $^{\circ} C$ (Nearest integer) Assume $100%$ ionization for both $NaCl$ and $MgCl_{2}$ Given : $K_{b} (H_{2} O) = 0.52 K kg mol^{- 1}$ Molar mass of $NaCl$ and $MgCl_{2}$ is $58.5$ and $95 g mol^{- 1}$ respectively.
Show answer
Answer: 116
Q612023 · 12 Apr 2023 · Shift 1
Given below are two statements : Statement I : Boron is extremely hard indicating its high lattice energy. Statement II : Boron has highest melting and boiling point compared to its other group members. In the light of the above statements, choose the most appropriate answer from the options given below :
1. A.Both Statement I and Statement II are incorrect
2. B.Statement I is incorrect but Statement II is correct
3. C.Statement I is correct but Statement II is incorrect
4. D.Both statement I and Statement II are correct
Show answer
Answer: D
Q892023 · 10 Apr 2023 · Shift 1· Numerical answer
If the degree of dissociation of aqueous solution of weak monobasic acid is determined to be 0.3, then the observed freezing point will be ___________% higher than the expected/theoretical freezing point. (Nearest integer)
Show answer
Answer: 30
Q812023 · 10 Apr 2023 · Shift 2· Numerical answer
An aqueous solution of volume $300 cm^{3}$ contains 0.63 g of protein. The osmotic pressure of the solution at 300 K is 1.29 mbar. The molar mass of the protein is _________ $g mol^{- 1}$ Given : $R = 0.083 L bar K^{- 1} mol^{- 1}$
Show answer
Answer: 40535
Q612023 · 8 Apr 2023 · Shift 1
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Butan -1- ol has higher boiling point than ethoxyethane. Reason R: Extensive hydrogen bonding leads to stronger association of molecules. In the light of the above statements, choose the correct answer from the options given below:
1. A.A is false but R is true
2. B.Both A and R are true but R is not the correct explanation of A
3. C.Both A and R are true and R is the correct explanation of A
4. D.A is true but R is false
Show answer
Answer: C
Q872023 · 8 Apr 2023 · Shift 1· Numerical answer
Show answer
Answer: 82
Q842023 · 8 Apr 2023 · Shift 2· Numerical answer
If the boiling points of two solvents X and Y (having same molecular weights) are in the ratio $2 : 1$ and their enthalpy of vaporizations are in the ratio $1 : 2$ , then the boiling point elevation constant of X is $\underline{m}$ times the boiling point elevation constant of Y. The value of m is ____ (nearest integer)
Show answer
Answer: 8
Q652023 · 1 Feb 2023 · Shift 1
1. A.A and B only
2. B.A, C & D only
3. C.B, C & D only
4. D.C and D only
Show answer
Answer: D
Q812023 · 1 Feb 2023 · Shift 1· Numerical answer
$25 mL$ of an aqueous solution of $KCl$ was found to require $20 mL$ of $1 M AgNO_{3}$ solution when titrated using $K_{2} CrO_{4}$ as an indicator. What is the depression in freezing point of $KCl$ solution of the given concentration? ________ (Nearest integer). (Given : $K_{f} = 2.0 K kg mol^{- 1}$ ) Assume 1) $100%$ ionization and 2) density of the aqueous solution as $1 g mL^{- 1}$
Show answer
Answer: 3
Q852023 · 31 Jan 2023 · Shift 1· Numerical answer
At $2 7^{\circ} C$ , a solution containing $2.5 g$ of solute in $250.0 mL$ of solution exerts an osmotic pressure of $400 Pa$ . The molar mass of the solute is ___________ $g mol^{- 1}$ (Nearest integer) (Given : $R = 0.083 L bar K^{- 1} mol^{- 1}$ )
Show answer
Answer: 62250
Q662023 · 31 Jan 2023 · Shift 2
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 :
1. A.A, B and D only
2. B.A and C only
3. C.B and D only
4. D.B, D and E only
Show answer
Answer: C
Q642023 · 29 Jan 2023 · Shift 1
1. A.(A), (B) and (E) only
2. B.(A), (C) and (D) only
3. C.(A), (C) and (E) only
4. D.(B), (C) and (D) only
Show answer
Answer: C
Q712023 · 29 Jan 2023 · Shift 2
Match List I with List II $A. B. C. D. List I van’t Hoff factor, i k_{f} Solutions with same osmotic pressure Azeotropes I. II. III. IV. List II Cryoscopic constant Isotonic solutions \frac{Normal molar mass}{Abnormal molar mass} Solutions with same composition of vapour above it$ Choose the correct answer from the options given below :
1. A.A-III, B-I, C-IV, D-II
2. B.A-III, B-I, C-II, D-IV
3. C.A-III, B-II, C-I, D-IV
4. D.A-I, B-III, C-II, D-IV
Show answer
Answer: B
Q842023 · 25 Jan 2023 · Shift 1· Numerical answer
Show answer
Answer: 41500
Q822023 · 25 Jan 2023 · Shift 2· Numerical answer
The number of pairs of the solutions having the same value of the osmotic pressure from the following is ____. (Assume 100% ionization) A. 0.500 $M C_{2} H_{5} OH (aq)$ and 0.25 $M KBr (aq)$ B. 0.100 $M K_{4} [Fe (CN)_{6}] (aq)$ and 0.100 $M FeS O_{4} (N H_{4})_{2} S O_{4} (aq)$ C. 0.05 $M K_{4} [Fe (CN)_{6}] (aq)$ and 0.25 $M NaCl (aq)$ D. 0.15 $M NaCl (aq)$ and 0.1 $M BaC l_{2} (aq)$ E. 0.02 $M KCl.MgC l_{2} .6 H_{2} O (aq)$ and 0.05 $M KCl (aq)$
Show answer
Answer: 4
Q702023 · 24 Jan 2023 · Shift 1
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 :
1. A.A and C only
2. B.A only
3. C.A and D only
4. D.B and C only
Show answer
Answer: C
Q762023 · 24 Jan 2023 · Shift 1
Statement I : For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at same concentration. Statement II : For colloidal particles, the potential difference between the fixed layer and the diffused layer of same charges is called the electrokinetic potential or zeta potential. In the light of the above statements, choose the correct answer from the options given below
1. A.Both Statement I and Statement II are false
2. B.Statement I is true and Statement II is false
3. C.Both Statement I and Statement II are true
4. D.Statement I is false but Statement II is true
Show answer
Answer: B