1.

Which of the following change requires a reducing agent

Answer»

`CrO_(4)^(2-)RARR Cr_(2)O_(7)^(2-)`
`BrO_(3)^(2-)rarr BrO^(-)`
`NH_(3)rarrNF_(3)`
`AL(OH)_(3)rarrAl(OH)_(4)^(-)`

Answer :B


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