Polymers — Chemistry STD 12 Science — Question

(Given atomic number: $\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23$, $\mathrm{Cr}: 24, \mathrm{Mn}: 25, \mathrm{Fe}: 26, \mathrm{Co}: 27, \mathrm{Ni}: 28, \mathrm{Cu}: 29$, $\mathrm{Zn}: 30)$

$(a)$  saline hydrides produce $H_2$ gas when reacted with $H_2O.$

$(b)$ reaction of $LiAH_4$ 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.

$R-NH_2$  $\xrightarrow[{HCl}]{{NaN{O_2}}}$ $..................$

(a gas is evolves with brisk effervescene is)