H2 S is used for precipitation of cation...

`H_2 S` is used for precipitation of cations of

A

2nd group

B

2nd and 4th group

C

3rd and 4th group

D

4th and 5th group

Text Solution

Verified by Experts

The correct Answer is:

B

`H_2 S ` burns in air or oxygen with a blue flame
`2H_2 S + underset("Excess")(3O_2) overset("Burning")to 2H_2 O + 2SO_2`

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