1.

Which of the following changes requires reducing agent ?

Answer»

`CrO_(4)^(2-) rarr Cr_(2)O_(7)^(2-)`
`BrO_(3) ^(-) rarr BrO^(-)`
`H_(2)AO_(3)rarr HAsO_(4)^(2-)`
`AL(OH)_(3)rarr Al(OH)_(4)^(-)`

Answer :B


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