How many water molecules are present in the formula of crystalline lithium chloride?

Heating a metal $X$ in nitrogen gas gives $Y$. The reaction of $Y$ with $H_2O$ produces a colorless gas. When this gas is passed through $CuSO_4$ solution,it produces a blue color. What is $Y$?

Match List-$I$ with List-$II$ :

List-$I$	List-$II$
$A$. $K$	$I$. Thermonuclear reactions
$B$. $KCl$	$II$. Fertilizer
$C$. $KOH$	$III$. Sodium potassium pump
$D$. $Li$	$IV$. Absorbent of $CO_2$

Choose the correct answer from the options given below :

Which of the following has the highest electrical conductivity in an aqueous solution?

Among alkali metal salts,lithium salts are the least conducting in their aqueous solutions. This is due to:

What happens if the concentration of $Na^{+}$ ions increases in the body?