1.

Balance given following half reaction for the unbalanced whole reaction : CrO_(4)^(2-)rarrCrO_(2)^(-)_OH^(-) is :

Answer»

`CrO_(4)^(-2)+2H_(2)O+3e^(-)rarrCrO_(2)^(-)+4H_(2)O^(-)`
`2CrO_(4)^(2-)+8H_(2)OrarrCrO_(2)^(-)+4H_(2)O+8OH^(-)`
`CrO_(4)^(-2)+H_(2)OrarrCrO_(2)^(-)+H_(2)O+OH^(-)`
`3CrO_(4)^(-2)+4H_(2)O+6e^(-)rarr2CrO_(2)^(-1)+8OH^(-)`

Answer :A


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