WBJEE PYQs for Solutions with Solutions: Practice WBJEE Previous Year Questions

Updated on - Dec 30, 2025

Solutions is an important topic in the Chemistry section in WBJEE exam. Practising this topic will increase your score overall and make your conceptual grip on WBJEE exam stronger.

This article gives you a full set of WBJEE PYQs for Solutions with explanations for effective preparation. Practice of WBJEE Chemistry PYQs including Solutions questions regularly will improve accuracy, speed, and confidence in the WBJEE 2026 exam.

WBJEE PYQs for Solutions with Solutions

1.
To observe an elevation of boiling point of $0.05^?C$, the amount of solute (Mol. $Wt. = 100$) to be added to $100\, g$ of water $(K_b=0.5)$ is
- 2 g
- 0.5 g
- 1 g
- 0.75 g
View Solution
2.
Among the following complex compounds– $K_{3} [Fe (CN)_{6}]$ $(i)$ $[Co {({NH}_{3})}_{6}] {Cl}_{3}$ (ii) $K_{2} [Pt (CN)_{4}]$ $(iii)$ $[Zn {(H_{2} O)}_{6}] {({NO}_{3})}_{2}$ $(i v)$ diamagnetic complexes are –
- (A) (i), (ii) and (iii)
- (B) (ii) and (iii)
- (C) (i) and (iv)
- (D) (ii), (iii) and (iv)
View Solution
3.
What will happen to the volume of a bubble of air found under water in a lake, where the temperature is 15^oC and the pressure is 1.5 atm, if the bubble rises to the surface where the temperature is 25^oC and the pressure is 1.0 atm?
- (A) Its volume will increase by a factor of 2.5.
- (B) Its volume will increase by a factor of 1.6.
- (C) Its volume will increase by a factor of 1.1.
- (D) Its volume will increase by a factor of 0.70.
View Solution
4.
Equal volumes of molar hydrochloric acid and sulphuric acid are neutralised by dilute NaOH solution and x kcal and y kcal of heat are liberated respectively. Which of the following is true?
- (A) x= y
- (B) $x = \frac{y}{2}$
- (C) x= 2y
- (D) None of the above
View Solution
5.
Pick the correct statement:
- Relative lowering of vapour pressure is independent of T.
- Osmotic pressure always depends on the nature of solute.
- Elevation of boiling point is independent of nature of the solvent.
- Lowering of freezing point is proportional to the molar concentration of solute.
View Solution
6.
The reaction that takes place when Cl2 gas is passed through conc. NaOH solution is :
- (A) Oxidation
- (B) Reduction
- (C) Displacement
- (D) Disproportionation
View Solution
7.
A solution containing 4g of polymer in a 4.0-litre solution at 27°C shows an osmotic pressure of 3.0×10^-4 atm. The molar mass of the polymer in g/mol is
- 820000
- 82000
- 8200
- 820
View Solution
8.
At a certain temperature, the value of the slope of the plot of osmotic pressure $(\pi)$ against concentration $\left(C\right.$ in $mol\, L ^{-1}$ ) of a certain polymer solution is $291\, R$. The temperature at which osmotic pressure is measured, is $(R$ is gas constant)
- $271^{\circ} C$
- $18^{\circ} C$
- $564\, K$
- $18\, K$
View Solution
9.
In OF2, H2O and OCl2, there is sp³ hybridisation of central atom. The bond length and bond angle of OF2, H2O and OCl2 are given as:
Which of the following is the correct statement about the differences in the bond angles of the compounds given above?
- (A) Hydrogen is the least electronegative, and electron density around the central atom increases.
- (B) Fluorine is the most electronegative, and electron density around the central atom increases.
- (C) Cl is the most electronegative, and electron density around the central atom increases.
- (D) Due to larger size of Cl, electron density around the central atom decreases.
View Solution
10.
63g of a compound (Mol.Wt.=126) was dissolved in 500g of distilled water.The density of the resultant solution is 1.126g/ml. The molarity of the solution is
- 1.25M
- 1.0M
- 0.75M
- 1.1M
View Solution
11.
Which of the following solutions is an example of negative deviation from Raoult�s law?
- Acetone + Ethanol
- Carbon tetrachloride + Chloroform
- Acetone + Chloroform
- Water + Ethanol
View Solution
12.
Which of the following is the hydrophobic synthetic acrylate polymer that has glass-transition temperature of about 10°C?
- (A) Poly(methyl acrylate)
- (B) Poly(methyl methacrylate)
- (C) Poly(N-isopropylacrylamide)
- (D) Sodium polyacrylate
View Solution
13.
$58.4\, gm$ of $NaCl$ and $180\,gm$ of glucose were separately dissolved in $1000 \,mL$ of water. Identify the correct statement regarding the elevation of boiling point ($b.pt$) of the resulting solutions.
- NaCl solution will show higher elevation of b.pt
- Glucose solution will show higher elevation of b.pt
- Both the solution will show equal elevation of b.pt
- The b.p. elevation will be shown by neither of the solutions
View Solution
14.
Which of the following type of compound is used to increase the hardness of the silicone polymer.
- (A) R2SiCl2
- (B) RSiCl3
- (C) R3SiCl
- (D) None of these
View Solution

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WBJEE PYQs for Solutions with Solutions: Practice WBJEE Previous Year Questions

WBJEE PYQs for Solutions with Solutions

1.
To observe an elevation of boiling point of $0.05^?C$, the amount of solute (Mol. $Wt. = 100$) to be added to $100\, g$ of water $(K_b=0.5)$ is

2.
Among the following complex compounds– $K_{3} [Fe (CN)_{6}]$ $(i)$ $[Co {({NH}_{3})}_{6}] {Cl}_{3}$ (ii) $K_{2} [Pt (CN)_{4}]$ $(iii)$ $[Zn {(H_{2} O)}_{6}] {({NO}_{3})}_{2}$ $(i v)$ diamagnetic complexes are –

3.
What will happen to the volume of a bubble of air found under water in a lake, where the temperature is 15^oC and the pressure is 1.5 atm, if the bubble rises to the surface where the temperature is 25^oC and the pressure is 1.0 atm?

4.
Equal volumes of molar hydrochloric acid and sulphuric acid are neutralised by dilute NaOH solution and x kcal and y kcal of heat are liberated respectively. Which of the following is true?

5.
Pick the correct statement:

6.
The reaction that takes place when Cl2 gas is passed through conc. NaOH solution is :

7.
A solution containing 4g of polymer in a 4.0-litre solution at 27°C shows an osmotic pressure of 3.0×10^-4 atm. The molar mass of the polymer in g/mol is

8.
At a certain temperature, the value of the slope of the plot of osmotic pressure $(\pi)$ against concentration $\left(C\right.$ in $mol\, L ^{-1}$ ) of a certain polymer solution is $291\, R$. The temperature at which osmotic pressure is measured, is $(R$ is gas constant)

9.
In OF2, H2O and OCl2, there is sp³ hybridisation of central atom. The bond length and bond angle of OF2, H2O and OCl2 are given as:
Which of the following is the correct statement about the differences in the bond angles of the compounds given above?

10.
63g of a compound (Mol.Wt.=126) was dissolved in 500g of distilled water.The density of the resultant solution is 1.126g/ml. The molarity of the solution is

11.
Which of the following solutions is an example of negative deviation from Raoult�s law?

12.
Which of the following is the hydrophobic synthetic acrylate polymer that has glass-transition temperature of about 10°C?

13.
$58.4\, gm$ of $NaCl$ and $180\,gm$ of glucose were separately dissolved in $1000 \,mL$ of water. Identify the correct statement regarding the elevation of boiling point ($b.pt$) of the resulting solutions.

14.
Which of the following type of compound is used to increase the hardness of the silicone polymer.

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WBJEE PYQs for Solutions with Solutions

1.To observe an elevation of boiling point of $0.05^?C$, the amount of solute (Mol. $Wt. = 100$) to be added to $100\, g$ of water $(K_b=0.5)$ is

2.Among the following complex compounds–K3[Fe(CN)6](i)[Co(NH3)6]Cl3(ii) K2[Pt(CN)4](iii)[Zn(H2O)6](NO3)2(iv)diamagnetic complexes are –

3.What will happen to the volume of a bubble of air found under water in a lake, where the temperature is 15oC and the pressure is 1.5 atm, if the bubble rises to the surface where the temperature is 25oC and the pressure is 1.0 atm?

4.Equal volumes of molar hydrochloric acid and sulphuric acid are neutralised by dilute NaOH solution and x kcal and y kcal of heat are liberated respectively. Which of the following is true?

5. Pick the correct statement:

6.The reaction that takes place when Cl2 gas is passed through conc. NaOH solution is :

7.A solution containing 4g of polymer in a 4.0-litre solution at 27°C shows an osmotic pressure of 3.0×10-4 atm. The molar mass of the polymer in g/mol is

8.At a certain temperature, the value of the slope of the plot of osmotic pressure $(\pi)$ against concentration $\left(C\right.$ in $mol\, L ^{-1}$ ) of a certain polymer solution is $291\, R$. The temperature at which osmotic pressure is measured, is $(R$ is gas constant)

9.In OF2, H2O and OCl2, there is sp3 hybridisation of central atom. The bond length and bond angle of OF2, H2O and OCl2 are given as:Which of the following is the correct statement about the differences in the bond angles of the compounds given above?

10.63g of a compound (Mol.Wt.=126) was dissolved in 500g of distilled water.The density of the resultant solution is 1.126g/ml. The molarity of the solution is

11.Which of the following solutions is an example of negative deviation from Raoult�s law?

12.Which of the following is the hydrophobic synthetic acrylate polymer that has glass-transition temperature of about 10°C?

13.$58.4\, gm$ of $NaCl$ and $180\,gm$ of glucose were separately dissolved in $1000 \,mL$ of water. Identify the correct statement regarding the elevation of boiling point ($b.pt$) of the resulting solutions.

14.Which of the following type of compound is used to increase the hardness of the silicone polymer.

Fees Structure

Structure based on different categories

Comments

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1.
To observe an elevation of boiling point of $0.05^?C$, the amount of solute (Mol. $Wt. = 100$) to be added to $100\, g$ of water $(K_b=0.5)$ is

2.
Among the following complex compounds– $K_{3} [Fe (CN)_{6}]$ $(i)$ $[Co {({NH}_{3})}_{6}] {Cl}_{3}$ (ii) $K_{2} [Pt (CN)_{4}]$ $(iii)$ $[Zn {(H_{2} O)}_{6}] {({NO}_{3})}_{2}$ $(i v)$ diamagnetic complexes are –

3.
What will happen to the volume of a bubble of air found under water in a lake, where the temperature is 15^oC and the pressure is 1.5 atm, if the bubble rises to the surface where the temperature is 25^oC and the pressure is 1.0 atm?

4.
Equal volumes of molar hydrochloric acid and sulphuric acid are neutralised by dilute NaOH solution and x kcal and y kcal of heat are liberated respectively. Which of the following is true?

5.
Pick the correct statement:

6.
The reaction that takes place when Cl2 gas is passed through conc. NaOH solution is :

7.
A solution containing 4g of polymer in a 4.0-litre solution at 27°C shows an osmotic pressure of 3.0×10^-4 atm. The molar mass of the polymer in g/mol is

8.
At a certain temperature, the value of the slope of the plot of osmotic pressure $(\pi)$ against concentration $\left(C\right.$ in $mol\, L ^{-1}$ ) of a certain polymer solution is $291\, R$. The temperature at which osmotic pressure is measured, is $(R$ is gas constant)

9.
In OF2, H2O and OCl2, there is sp³ hybridisation of central atom. The bond length and bond angle of OF2, H2O and OCl2 are given as:
Which of the following is the correct statement about the differences in the bond angles of the compounds given above?

10.
63g of a compound (Mol.Wt.=126) was dissolved in 500g of distilled water.The density of the resultant solution is 1.126g/ml. The molarity of the solution is

11.
Which of the following solutions is an example of negative deviation from Raoult�s law?

12.
Which of the following is the hydrophobic synthetic acrylate polymer that has glass-transition temperature of about 10°C?

13.
$58.4\, gm$ of $NaCl$ and $180\,gm$ of glucose were separately dissolved in $1000 \,mL$ of water. Identify the correct statement regarding the elevation of boiling point ($b.pt$) of the resulting solutions.

14.
Which of the following type of compound is used to increase the hardness of the silicone polymer.