Ionisation of $H$-atom would produce

The element used for welding metals with high melting points is:

Which of the following substances can be used for drying gases?

Arrange the following:
$(i)$ $CaH_{2}$,$BeH_{2}$,and $TiH_{2}$ in order of increasing electrical conductance.
$(ii)$ $LiH$,$NaH$,and $CsH$ in order of increasing ionic character.
$(iii)$ $H-H$,$D-D$,and $F-F$ in order of increasing bond dissociation enthalpy.
$(iv)$ $NaH$,$MgH_{2}$,and $H_{2}O$ in order of increasing reducing property.

Which property of hydrogen distinguishes it from alkali metals?

$N_2H_4$ and $H_2O_2$ show similarity in