1.

Whichof the followngreaction is used to makea fuelcell

Answer»

`CD(s)+2Ni(OH)_(3)(s)rarrCd(s)+2Ni(OH)_(2)(s)+H_(2)O(l)`
`Pb(s)+PbO_(2)(s)+2H_(2)(aq)rarr2PbSO_(4)(s)+2H_(2)O(l)`
`2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l)`
`2Fe(s)+O_(2)(g)+4H^(+)(aq)rarr2Fe^(2+)(aq)+2H_(2)O(l)`

Solution :Cellwhichconvertcehemical energy of a FUEL DIRECTLY into electricla energy is called fuel cell reactiontaking place `H_(2) -O_(2)` FUELCELL
`2H_(2) (g)+O_(2) (g) rarr 2H_(21)O(l)`


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