Which of the following statements is not true for hydrogen:
$1)$ It exists as a diatomic molecule.
$2)$ It has one electron in the outermost shell.
$3)$ It can lose an electron to form a cation which can freely exist.
$4)$ It cannot form ionic compounds.

Which compound is formed on catalytic hydrogenation of carbon monoxide at high $p$ and high $T$ in the presence of $ZnO-Cr_2O_3$ catalyst?

Complete the reaction: $8LiH + Al_2Cl_6 \to ?$

The correct statements among $(a)$ to $(d)$ are:
$(a)$ Saline hydrides produce $H_2$ gas when reacted with $H_2O$.
$(b)$ Reaction of $LiAlH_4$ with $BF_3$ leads to $B_2H_6$.
$(c)$ $PH_3$ and $CH_4$ are electron-rich and electron-precise hydrides,respectively.
$(d)$ $HF$ and $CH_4$ are called as molecular hydrides.

Which of the following is distilled first during the fractional distillation of liquid air or mixtures of these gases?

Which is distilled first?