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NEET Chemistry Solutions 2026 NEET 2026 (Cancelled)

NEET Chemistry Question (2026) — Solution

Question

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 = n_A n_A + n_B . Choose the correct answer from the options given below :

Options

  1. A. A, B and C only
  2. B. A and B only
  3. C. A and C only
  4. D. A, D and E only

Answer

A. A, B and C only

Step-by-step solution

Statement A : Molality is given by the number of moles of solute divided by the mass of solvent in kg. Moles of ethanoic acid = 2.5 60 = 1 24 mol Mass of benzene = 75 g = 0.075 kg Molality = 1/24 0.075 = 1000 24 75 = 1000 1800 = 5 9 = 0.556 m Statement A is correct. Statement B : Molarity is given by the number of moles of solute divided by the volume of solution in litres. Moles of NaOH = 5 40 = 1 8 mol Volume of solution = 450 mL = 0.45 L Molarity = 1/8 0.45 = 1000 8 450 = 1000 3600 = 5 18 = 0.278 M Statement B is correct. Statement C : The solubility of gases (like oxygen) in water increases with a decrease in temperature. Therefore, cold water contains more dissolved oxygen, making aquatic species more comfortable. Statement C is correct. Statement D : According to Henry's law, the solubility of a gas in a liquid is directly proportional to the pressure of the gas. Thus, solubility decreases with a decrease in pressure. Statement D is incorrect. Statement E : The mole fraction of component B is the ratio of the number of moles of B to the total number of moles in the mixture. x_B = n_B n_A + n_B Statement E is incorrect. Therefore, only statements A, B, and C are correct. Answer: A, B and C only

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