Which of the following statements about Henry's law are correct?

AFor most gases in water, $K_{H}$ increases with temperature, so solubility decreases on heating
BAt a fixed temperature the mole fraction of a gas dissolved in a liquid is proportional to its partial pressure over the liquid
CA gas with a larger $K_{H}$ is more soluble at a given pressure
DSoda water bottles are sealed under high $CO X_{2}$ pressure to increase the solubility of $CO X_{2}$

Answer: A, B, D

Henry's law is

p = K_{H} x

, so

x \propto p

(statement 2) and

x = p / K_{H}

, so a larger

K_{H}

means lower solubility (statement 3 is wrong).

K_{H}

rises with temperature for common gases, so solubility falls (statement 1). Higher

CO X_{2}

pressure raises

x

(statement 4). Answer: 1, 2 and 4.