Which of the following can be used to extinguish a fire caused by alkali metals?

Choose the false statement regarding the properties of sodium hydroxide $(NaOH)$.

Identify the correct statements from the following :
$I$. Tendency to form halide hydrates gradually increases from $Be$ to $Ba$ down the group.
$II$. Tendency to form stable superoxides increases from $Li$ to $Cs$ down the group.
$III$. Low solubility of $LiF$ is due to its high lattice energy.
$IV$. Solubility of carbonates of group-$2$ elements increases down the group.

Which of the following alkali metal ions has the lowest ionic mobility in an aqueous solution?

The catalyst used to convert sodium to sodium amide is

$NaNO_3$ on heating gives which gas?