Solubility of a gas in a liquid increases with

Which one is an example of a solid solution?

Why do gases always tend to be less soluble in liquids as the temperature is raised?

$K_H$ is Henry's constant and has the unit

The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportions of $20 \%$ and $79 \%$ by volume at $298 \ K$. The water is in equilibrium with air at a total pressure of $10 \ atm$. At $298 \ K$,if the Henry's law constants for oxygen and nitrogen are $3.30 \times 10^{7} \ mm \ Hg$ and $6.51 \times 10^{7} \ mm \ Hg$ respectively,calculate the mole fractions of these gases in water.

What is solubility? What is a saturated solution?