Question

On electrolysis of CaH${}_2$ solution in water, O${}_2$ gas is liberated at anode and H${}_2$ gas is liberated at cathode.
If true enter 1, else enter 0.

Answer 1

On electrolysis of CaH${}_2$ solution in water, O${}_2$ gas is liberated at anode and H${}_2$ gas is liberated at cathode.
At cathode, $2H^{+}+2e^{-}\to H_2\uparrow$
At anode, $4O{H}^{-}\to 2H_{2}O+O_2+4e^{-}$
The discharge potential of $H^{+}$ ions is lower than the discharge potential of $C{a}^{2+}$ ions.
Similarly, the discharge potential of hydroxide ions is lower than the discharge potential of hydride ions.