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Dioxygen is not evolved when conc. H(2)S...

Dioxygen is not evolved when conc. `H_(2)SO_(4)` reacts with

A

`MnO_(3)`

B

`CuSO_(4)`

C

`KMnO_(4)`

D

`K_(2)Cr_(2)O_(7)`

Text Solution

Verified by Experts

The correct Answer is:
B

`CuSO_(2)+H_(2)SO_(4)rarr"No reaction"`
`2MnO_(2)+2H_(2)SO_(4)rarr2MnSO_(4)+2H_(2)O+O_(2)`
`4KMnO_(4)+6H_(2)SO_(4)+6H_(2)SO_(4)overset(Delta)rarr2K_(2)SO_(4)+4MnSO_(4)+6H_(2)O+SO_(2)`
`2K_(2)Cr_(2)O_(7)+8H_(2)SO_(4)overset(Delta)rarr2K_(2)SO_(4)+2Cr_(2)(SO_(4))_(3)+8H_(2)O+3O_(2)`
We can add `H_(2)O_(2)` to acidified `KMnO_(4)` solution:
`{:(2KMnO_(4)+3H_(2)SO_(4)rarrK_(2)SO_(4)+2MnSO_(4)+3H_(2)O+5[O]),(H_(2)O_(2)+OrarrH_(2)O+O_(2)xx5):}/(2KMnO_(4)+3H_(2)SO_(4)+5H_(2)O_(2)rarrK_(2)SO_(4)+2MnSO_(4)+8H_(2)O+5O_(2))`
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