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  • Which among the following is correct about electrolysis of metal hydride?Option: 1 <img alt="\mathrm{H}^{+}" src="https://entrancecorner.oncodecogs.c

Which among the following is correct about electrolysis of metal hydride?

Option: 1

\mathrm{H}^{+} ions moving toward the cathode
 


Option: 2

\mathrm{H}^{+} ion moving towards the anode
 


Option: 3

\mathrm{H}_2 is liberated at anode
 


Option: 4

\mathrm{H}_2  is liberated at cathode


Answers (1)

best_answer

Metal hydrides are formed on reaction of highly electropositive s-block elements with hydrogen \mathrm{(exception \, \, \mathrm{BeH}_2\ and \ \mathrm{MgH}_2 )}. These hydrides in liquid state gives negatively charged \mathrm{H}^{-}. ions During electrolysis, the oxidation reaction takes place at anode. When metal hydrides are electrolysed, the \mathrm{H}^{-} ions move towards anode where oxidation of hydride takes place and hydrogen is liberated. At cathode, metal accumulates. Eg. Electrolysis of \mathrm{NaH}

\mathrm{Cathode: 2 \mathrm{Na}^{+}+2 e^{-} \rightarrow\underset{\textup{sodium metal}}{ 2 \mathrm{Na}(\mathrm{l})}}

\mathrm{\text { Anode: } 2 \mathrm{H}^{-} \rightarrow \underset{\substack{\text { Hydrogen gas }}}{\mathrm{H}_2(g)}+2 e^{-}}

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