Asthma patients use a mixture of ........... for breathing.

Which property among the following is the same for both hydrogen and deuterium molecules?

Which of the following explanations is best for not placing hydrogen with alkali metals or halogens?

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.

Action of water or dilute mineral acids on metals can give

Identify the electron-rich hydrides from the following.