1.

Which of the following is a disproportion reaction ?

Answer»

`NO_(3)^(-) + Cu rarr NO + Cu^(2+) `
`HNO_(2) rarr NO_(3)^(-) + NO`
`Zn+ O_(2) rarr ZnO`
`S_(2) O_(3)^(2-) + Cr_(2) O_(7)^(2-) rarr S_(4) O_(6)^(2-) +Cr^(3+)`

ANSWER :B


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