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Sometimes yellow turbidity appears while...

Sometimes yellow turbidity appears while passing `H_(2)S` gas even in the absence of II group radicals. This is because of

A

sulphur is present in the mixture as impurity

B

(IV) grou radicals are precipitated as sulphides

C

the oxidation of `H_(2)S` gas by some acid radicals

D

III group radicals are precipitated as hydroxides

Text Solution

Verified by Experts

The correct Answer is:
C
On passing `H_(2)S` gas into first group filtrate sometimes yellow turbidity appears even in the absence of II group radicals, this is because of the oxidation of `H_(2)S` gas by some acid radicals and form colloidal solution of sulphur.
`Fe_((aq.))^(3+)underset(("redox reaction"))overset(H_(2)S//H^(+))to Fe_((aq.))^(2+)+Sdarr`
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