What is Carbogen?

The hydride ions $({H^{-}})$ are isoelectronic with

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

Consider the following sequence of reactions: $Na + NH_{3(g)} \to [X]$ $\xrightarrow{N_2O} [Y]$ $\xrightarrow{\text{Heat}} [Z] (\text{Gas, Pure})$. Identify $[Z]$ gas.

Hydrogen readily combines with non-metals and thus it shows its

Name the classes of hydrides to which $H_2O$,$B_2H_6$ and $NaH$ belong.