The colour of hydrogen is

Saline hydrides are known to react with water violently producing fire. Can $CO_2$,a well-known fire extinguisher,be used in this case? Explain.

Exhausted permutit does not contain ....... ion.

Atoms in hydrogen gas have a preponderance of which isotope?

Calcium imide on hydrolysis will give gas $(B)$ which on oxidation by bleaching powder gives gas $(C)$. Gas $(C)$ on reaction with magnesium gives compound $(D)$. $(D)$ on hydrolysis gives again gas $(B)$. $(B)$,$(C)$ and $(D)$ are

Which one of the following substances is used in the laboratory for a fast drying of neutral gases?