Nelson cell is used for the preparation of

When compared with alkaline earth metals, the alkali metals have

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.

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

Which of the following metals is not found in the free state?

Which of the following properties is $NOT$ correct for alkali metals?