Which among the following salts exhibits an inverse relation between its solubility and temperature?

Why are aquatic species more comfortable in cold water in comparison to warm water?

$5.5 \text{ mg}$ of nitrogen gas dissolves in $180 \text{ g}$ of water at $273 \text{ K}$ and $1 \text{ atm}$ pressure due to nitrogen gas. The mole fraction of nitrogen in $180 \text{ g}$ of water at $5 \text{ atm}$ nitrogen pressure is approximately:

The solubility curve of $KNO_3$ in water is shown below. The amount of $KNO_3$ that dissolves in $50 \ g$ of water at $40^{\circ} C$ is closest to $.... \ g$

The solubility of a gas in a liquid increases with:

Calculate the pressure of the gas if the solubility of the gas in water at $25^{\circ} C$ is $6.85 \times 10^{-4} \ mol \ dm^{-3}$. (Henry's law constant $K_H$ is $6.85 \times 10^{-4} \ mol \ dm^{-3} \ bar^{-1}$) (in $bar$)