Molality, molarity, Henry's law, and mole fraction

2026 1 question

1. Identify the correct statements: I. 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. II. 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. III. Aquatic species are more comfortable in cold water. IV. The solubility of gas increases with decrease in pressure. V. 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: