NEET 2026 Chemistry question
Identify the correct statements : (A) The molality of 2.5 g of ethanoic acid (Molar mass : 60 g mol) 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) 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 and respectively. The mole fraction of B will be . Choose the **correct** answer from the options given below :
Solution
(A) Moles = 2.5/60 = 0.04167; mass of solvent = 0.075 kg; molality = 0.04167/0.075 = 0.556 m. True. (B) Moles NaOH = 5/40 = 0.125; molarity = 0.125/0.450 L = 0.278 M. True. (C) Gas solubility decreases with rise in temperature (Henry's constant increases), so cold water holds more
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