Which of the following salt's solubility increases appreciably with an increase in temperature?

Which among the following salts shows a decrease in solubility with an increase in temperature?

State Henry's law and explain it. Also,mention its applications.

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

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 pressure of $10\ atm$. At $298\ K$,if the Henry's law constants for oxygen and nitrogen are $3.30 \times 10^7\ mm$ and $6.51 \times 10^7\ mm$,respectively,the mole ratio of gases $(O_2 : N_2)$ dissolved in water is about

What kind of attractions are present in an aqueous solution of $NaCl$?