Which of the following is a disproportio...

Which of the following is a disproportion reaction ?

A

`NO_(3)^(-) + Cu rarr NO + Cu^(2+) `

B

`HNO_(2) rarr NO_(3)^(-) + NO`

C

`Zn+ O_(2) rarr ZnO`

D

`S_(2) O_(3)^(2-) + Cr_(2) O_(7)^(2-) rarr S_(4) O_(4)^(2-) + Cr^(3+)`

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The correct Answer is:

B

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