The sum of the number of protons and neutrons in all isotopes of hydrogen is .......

The correct statements among $(a)$ to $(d)$ are:
$(a)$ Saline hydrides produce $H_2$ gas when reacted with $H_2O$.
$(b)$ Reaction of $LiAlH_4$ with $BF_3$ leads to $B_2H_6$.
$(c)$ $PH_3$ and $CH_4$ are electron-rich and electron-precise hydrides,respectively.
$(d)$ $HF$ and $CH_4$ are called as molecular hydrides.

Dihydrogen of high purity $(>99.95 \%)$ is obtained through:

Which one of the following statements is not correct for ortho and para hydrogen?

When sugar is brought into contact with concentrated $H_2SO_4$,it turns black due to .......

Which compound is used in hydrogen generators?