What else is present in a fire extinguisher besides $H_2SO_4$?

Which among the following is/are primary component$(s)$ of the synthesis gas?

Identify the reactions in which $H_2$ is liberated? $(i)$ $Zn + NaOH_{(aq)} \longrightarrow$ $(ii)$ $HCOOH \xrightarrow[\text{Conc. } H_2SO_4]{373 \ K}$ $(iii)$ $CH_{4(g)} + H_2O_{(g)} \xrightarrow[Ni]{1270 \ K}$ $(iv)$ $Zn + H^+_{(aq)} \longrightarrow$ $(v)$ $C_{(s)} + H_2O_{(g)} \xrightarrow{1270 \ K}$

Which of the following is a hydride?

Which is an example of a molecular hydride?

In which of the following reactions, hydrogen is evolved?
$I$. Reaction of sodium borohydride with iodine
$II$. Oxidation of diborane
$III$. Reaction of boron trifluoride with sodium hydride
$IV$. Hydrolysis of diborane