`Na_(2)SO_(4)` and `Na_(2)S` can be distinguished from each other by using:

Options

A. dilute `H_(2)SO_(4)`
B. acidified `KMnO_(4)` solution
C. sodium nitroprusside solution
D. cadmium acetate solution

Answer

A,B,C,D

Explanation

(A)`Na_(2)S+H^(+)toH_(2)Suarr+2Na^(+).,Na_(2)SO_(4)` gives no reaction with `H_(2)SO_(4)`
(B)`2MnO_(4)^(-)`(pink solution)+`5H_(2)S+6H^(+) to 2Mn^(2+)` (colourless) +`5S darr +8H_(2)O`
No colour change is observed with `Na_(2)SO_(4)`
( C)`S^(2-)+[Fe(CN)_(5)NO]^(2-) to [Fe(CN)_(5)NOS]^(4-)` (purple or violet colouration)
No colour change is observed with `Na_(2)SO_(4)`
(D)`S^(2-)+Cd^(2+) to CdS darr` (yellow).
`Na_(2)SO_(4)` forms `CdSO_(4)` which is water soluble.