Solutions NEET PYQs (1988–2026)

Solved Solutions PYQs

3 recent questions with answers. The full set of 83 is free to practise.

1. NEET 2026HardConcentration Units
   Q1

   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 molality 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 $x_B=\frac{n_A}{n_A+n_B}$.
   
   Choose the correct answer from the options given below:

   • AA, B and C only
   • BA and B only
   • CA and C only
   • DA, D and E only

   Show answer & solution

   Correct answer: (A)

   (A) molality = (2.5/60)/(75/1000) = 0.556 m -- correct.
   
   (B) Molarity = (5/40)/(450/1000) = 0.278 M -- correct.
   
   (C) Cold water has more dissolved oxygen -- correct.
   
   (D) Solubility increases with increase in pressure -- incorrect.
   
   (E) x_B = n_B/(n_A+n_B) -- incorrect.
   
   So A, B, C correct.
2. NEET 2026MediumRaoult's Law
   Q2

   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.

   • AA and B only
   • BB and C only
   • CA only
   • DA and C only

   Show answer & solution

   Correct answer: (A)

   A is correct (ideal solution follows Raoult's law). B is correct
   
   (chloroform + acetone show negative deviation). C is incorrect
   
   (aniline + phenol show negative deviation due to H-bonding, not
   
   positive). So A and B only.
3. NEET 2026MediumIdeal Solutions
   Q3

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

   • ABoth A and R are correct and R is the correct
     
     explanation of A
   • BBoth A and R are correct but R is NOT the correct
     
     explanation of A
   • CA is correct but R is not correct
   • DA is not correct but R is correct

   Show answer & solution

   Correct answer: (C)

   For ideal solution, $\Delta H=0$ and $\Delta V=0$. This is because
   
   A-B interactions are same as A-A and B-B interactions, not because there
   
   are no interactions. So A is correct, R is false.

Topic-wise question count

Where NEET has asked from Solutions, most frequent first.

• Colligative Properties30
• Raoult's Law16
• Concentration Units14
• Ideal Solutions8
• Non-Ideal Solutions4
• van't Hoff Factor4
• Henry's Law2
• Preparation of Solutions2
• Colligative Properties (Elevation of Boiling Point)1
• Solubility1
• Azeotropes1

Year-wise Solutions questions in NEET

Number of questions from this chapter in each year's paper(s).