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In Which case (s), there is change in ox...

In Which case (s), there is change in oxidation number ?

A

Aqueous solution of `CrO_(4)^(2-)` is acidified

B

`SO_(2)` gas is passed through acidified `Cr_(2)O_(7)^(2-)` solution

C

`Cr_(2)O_(7)^(2-)` solution is made alkaline

D

`CrO_(2)Cl_(2)` is is dissolved in NaOH.

Text Solution

Verified by Experts

The correct Answer is:
B
(a) `2overset(+6)(Cr)O_(4)^(2-)+2H^(+)rarroverset(+6)Cr_(2)O_(7)^(2-)+H_(2)O " "("no change")`
`overset(+6)Cr_(2)O_(4)^(2-)+3overset(+4)SO_(2)+2H^(+)rarr2overset(+3)Cr^(3+)+3overset(+6)SO_(4)^(2-)+H_(2)O" "("change")`
`overset(+6)Cr_(2)O_(7)^(2-)+2OH^(-)rarr2overset(+6)CrO_(4)^(2-)+H_(2)O" "("no change")`
`overset(+6)CrO_(2)Cl_(2)+2NaOHrarrNaoverset(+6)CrO_(4)+2HCl" "("no change")`.
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Knowledge Check

  • In which reaction, there is change in oxidation number of N atom?

    A
    `2NO_(2) iff N_(2)O_(4)`
    B
    `2NO_(2)+H_(2)O rarr HNO_(3)+HNO_(2)`
    C
    `NH_(4)OH rarr NH_(4)^(+)+OH^(-)`
    D
    `N_(2)O_(5)+H_(2)O rarr 2HNO_(3)`

  • Identify the cases(s) where there in change in oxidation number.

    A
    Acidified soltuion of `Cr_(2)O_(4)^(2-)`
    B
    `SO_(2)` gas bubbled throught an acidic solution of `Cr_(2)O_(7)^(2-)`
    C
    Alkaline solution of `Cr_(2)O_(7)^(2-)`
    D
    Ammoniacal solution of `CrO_(4)^(2-)`

  • Identify the case where there is change in oxidation number

    A
    Acidified solution of `CrO_(4)^(2-)`
    B
    `SO_(2)` gas bubbled through an acidic solution of `Cr_(2)O_(7)^(2-)`
    C
    alkaline solution of `CrO_(4)^(2-)`
    D
    aqueous solution of `CrO_(2)CI_(2)` in NaOH