Which of the following radical can not be confirmed by using dil. HCl :

Options

A. `S^(2-)`
B. `S_(2)O_(3)^(2-)`
C. `NO_(3)^(-)`
D. None of these

Answer

C

Explanation

`S^(2-)+2HCl overset(Delta)to H_(2)S darr +2Cl^(-)`
Rotten egg smell (Specific smell)
`S_(2)O_(3)^(2-) + HCl overset(Delta)to SO_(2) uarr` (Suffocating gas) `+2Cl^(-)S darr ("yellow turbidity or white turbidity") +H_(2)O`
`NO_(2)^(-)+HCl overset(Delta)to HNO_(2)+Cl^(-) NO uarr ("colourless") overset("atmospheric air") to NO_(2) uarr` (Brwon colour gas)