1.

Oxidation potential of unimoles of calomel is

Answer»

`+ 0.25` V
`0.00`V
`+0.278 V`
`-0.28V`

SOLUTION :CALOMEL is used as a secondary reference electrode. Since Hg is less reactive than H , its STANDARD REDUCTION potential is positive . Hence , its standard oxidation potential must be negative , ie, `-2.28 V` . [As standard reduction potential = -standard oxidation potential.]


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