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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
Copper reacts with conc. `HNO_(3)` as follows :
`Cu+4HNO_(3)rarrCu(NO_(3))_(2)+2H_(2)O+2NO_(2)`
Copper reacts with dil. `HNO_(3)` as follows :
`3Cu+8HNO_(3)rarr3Cu(NO_(3))_(2)+4H_(2)O+2NO`
As equal volumes of `NO_(2)` and NO are evolved, add the two equations to get another equation
`4Cu+12HNO_(3)rarr4Cu(NO_(3))_(2)+6H_(2)O+2NO_(2)+2NO`
or `4Cu+12HNO_(3)rarr4Cu(NO_(3))_(2)+6H_(2)O+2NO_(2)+2NO`.
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Knowledge Check

  • When copper is treated with a certain concentration ofnitric acid, nitric oxide and nitrogen dioxide are liberated in equal volumes according to the equation. xCu + yHNO_3 rarr Cu(NO_3)_2 + NO+ NO_2 +H_2O The coefficients x and y are

    A
    2 and 3
    B
    2 and 6
    C
    1 and 3
    D
    3 and 8

  • When copper is treated with a certain concentration of nitric acid, nitric oxide and nitrogen dioxde are liberated in equal volumes according ot the equation x Cu + y HNO _(3) to Cu ( 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

  • The concept of oxidation number (O.N) is very important in under standing redox reaction s it helps to identify the oxidant / reductant in a redox reaction it also helps to (i) find oiut the possible molecular formula of any neutral compound and (ii) to balance redox reaction when copper is treated with a certain concentraton of nitric acid oxide and nitrogen dioxide are liberated in equal volume according to the equation XCu+YHNO_(3)rarrCu(NO_(3))_(2)+NO+NO_(2)+H_(2)O the coefficeents of x and y are

    A
    2 and 3
    B
    2 and 6
    C
    1 and 3
    D
    3 and 8

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