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When copper is treated with a certain co...

When copper is treated with a certain concentration of nitric acid, nitric oxide and nitrogen dioxide are liberated in equal volumes according to the equation
`xCu+yHNO_(3)rarrCu(NO_(3))_(2)+NO+NO_(2)+H_(2)O`
The coefficients `x` and `y` are

A

`2` and `3`

B

`2` and `6`

C

`1` and `3`

D

`3` and` 8`

Text Solution

Verified by Experts

The correct Answer is:
B
The balanced equation is
`CurarrCu^(2+)+2e^(-)`…..(i)
`H^(o+)+e(-)+HNO_(3)rarrNO_(2)+H_(2)O`….(ii)
`3H^(o+)+3e^(-)+HNO_(3)rarrNO+2H_(2)O`…..(iii)
Multiplying (i) by `2` and adding (i), (ii) and (iii), we get
`2Cu+4H^(o+)+2HNO_(3)rarr2Cu^(2+)+NO_(2)+NO+3H_(2)O`
or
`2Cu+6HNO_(3)rarr2Cu(NO_(3))_(2)+NO_(2)+NO+3H_(2)O`
`:. x and y` are `2 and 6`.
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