NEET Solutions PYQ practice sheet

12 previous-year NEET Chemistry questions from Solutions, newest papers first. Solutions carries 14 of the Chemistry questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

1. 1.

   RE-NEET 2026

   Assertion A: For an ideal solution formed by mixing liquids $\mathbf{P}$ and $\mathbf{Q}$, $\Delta_{mix}H = 0$ and $\Delta_{mix}V = 0$ Reason R: No interactions occur between $\mathbf{P}$ and $\mathbf{Q}$ In the light of the above statements, choose the most appropriate answer from the options given below.

   • (A)
     Both A and R are correct and R is the correct explanation of A
   • (B)
     Both A and R are correct but R is NOT the correct explanation of A
   • (C)
     A is correct but R is not correct
   • (D)
     A is not correct but R is correct
2. 2.

   RE-NEET 2026

   Consider the following statements about the solutions formed by mixing two liquids. A. An ideal solution thus formed obeys Raoult's law throughout the composition range. B. Mixture of chloroform and acetone shows negative deviation from Raoult's law. C. Mixture of aniline and phenol shows positive deviation from Raoult's law.

   • (A)
     A only
   • (B)
     B and C only
   • (C)
     A and B only
   • (D)
     A and C only
3. 3.

   NEET 2026

   Identify the correct statements: (A) The molality of 2.5 g of ethanoic acid (molar mass: 60 g mol$^{-1}$) in 75 g of benzene solution is 0.556 m. (B) The molarity of a solution containing 5 g of NaOH (molar mass: 40 g mol$^{-1}$) in 450 mL of solution is 0.278 M at 298 K. (C) Aquatic species are more comfortable in cold water. (D) The solubility of gas increases with decrease in pressure. (E) For a binary mixture of A and B, the number of moles of A and B are $n_A$ and $n_B$ respectively. The mole fraction of B will be $x_B=\dfrac{n_A}{n_A+n_B}$. Choose the correct answer from the options given below:

   • (A)
     A, B and C only
   • (B)
     A, D and E only
   • (C)
     A and B only
   • (D)
     A and C only
4. 4.

   NEET 2026

   Mixture of chloroform and acetone forms a solution with negative deviation from Raoult's law due to:

   • (A)
     Stronger intermolecular forces between chloroform molecules than those between chloroform and acetone molecules.
   • (B)
     Formation of hydrogen bonding between acetone and chloroform
   • (C)
     Increase in escaping tendency of molecules of each component.
   • (D)
     Repulsive forces.
5. 5.

   NEET 2024

   The Henry's law constant ($K_H$) values of three gases (A, B, C) in water are 145, $2\times10^{-5}$ and 35 kbar, respectively. The solubility of these gases in water follow the order:

   • (A)
     B > A > C
   • (B)
     B > C > A
   • (C)
     A > C > B
   • (D)
     A > B > C
6. 6.

   NEET 2024

   The plot of osmotic pressure ($\Pi$) vs concentration ($\mathrm{mol\ L^{-1}}$) for a solution gives a straight line with slope $25.73\ \mathrm{L\ bar\ mol^{-1}}$. The temperature at which the osmotic pressure measurement is done is: (Use $R=0.083\ \mathrm{L\ bar\ mol^{-1}K^{-1}}$)

   • (A)
     $37^\circ$C
   • (B)
     $25.73^\circ$C
   • (C)
     $310^\circ$C
   • (D)
     $12.05^\circ$C
7. 7.

   NEET 2023

   Given below are two statements : one is labelled as Assertion A and the other is labelled as Reasons R : Assertion A : Helium is used to dilute oxygen in diving apparatus. Reasons R : Helium has high solubility in $\mathrm{O_2}$. In the light of the above statements, choose the correct answer from the options given below :

   • (A)
     A is false but R is true.
   • (B)
     Both A and R are true and R is the correct explanation of A.
   • (C)
     Both A and R are true but R is NOT the correct explanation of A.
   • (D)
     A is true but R is false.
8. 8.

   NEET 2022

   In one molal solution that contains 0.5 mole of a solute, there is:

   • (A)
     1000 g of solvent
   • (B)
     500 mL of solvent
   • (C)
     500 g of solvent
   • (D)
     100 mL of solvent
9. 9.

   NEET 2021

   The following solutions were prepared by dissolving $10\ \mathrm{g}$ of glucose ($\mathrm{C_6H_{12}O_6}$) in $250\ \mathrm{ml}$ of water ($P_1$), $10\ \mathrm{g}$ of urea ($\mathrm{CH_4N_2O}$) in $250\ \mathrm{ml}$ of water ($P_2$) and $10\ \mathrm{g}$ of sucrose ($\mathrm{C_{12}H_{22}O_{11}}$) in $250\ \mathrm{ml}$ of water ($P_3$). The right option for the decreasing order of osmotic pressure of these solutions is :

   • (A)
     $P_3 > P_1 > P_2$
   • (B)
     $P_1 > P_2 > P_3$
   • (C)
     $P_2 > P_3 > P_1$
   • (D)
     $P_2 > P_1 > P_3$
10. 10.

    NEET 2021

    The correct option for the value of vapour pressure of a solution at $45^\circ\mathrm{C}$ with benzene to octane in molar ratio $3:2$ is : [At $45^\circ\mathrm{C}$ vapour pressure of benzene is $280\ \mathrm{mm\ Hg}$ and that of octane is $420\ \mathrm{mm\ Hg}$. Assume Ideal gas]

    • (A)
      $350\ \mathrm{mm\ of\ Hg}$
    • (B)
      $336\ \mathrm{mm\ of\ Hg}$
    • (C)
      $168\ \mathrm{mm\ of\ Hg}$
    • (D)
      $160\ \mathrm{mm\ of\ Hg}$
11. 11.

    NEET 2020

    The freezing point depression constant ($K_f$) of benzene is $5.12$ K kg mol$^{-1}$. The freezing point depression for the solution of molality $0.078$ m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places) :

    • (A)
      0.20 K
    • (B)
      0.80 K
    • (C)
      0.40 K
    • (D)
      0.60 K
12. 12.

    NEET 2020

    The mixture which shows positive deviation from Raoult's law is :

    • (A)
      Ethanol + Acetone
    • (B)
      Benzene + Toluene
    • (C)
      Acetone + Chloroform
    • (D)
      Chloroethane + Bromoethane