Which pair does not show hydrogen isotopes?

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 $H_2O$ in order of increasing reducing property.

Liquid ammonia is used in refrigeration because of its

Electrolysis of fused sodium hydride liberates hydrogen at the

Which of the following drying agents reacts with $CO_2$ and also removes moisture?

Which of the following is not suitable for use in a desiccator to dry substances?