A solution of a sodium salt gives yellow precipitate with both `Pb^(2+)` and `Ag^(+)` ions. Moreover, the acidified solution of sodium salt with `KNO_(2)` liberates a coloured gas which turns starch paper blue. The anion is `:`

Options

A. `I^(-)`
B. `Br^(-)`
C. `NO_(3)^(-)`
D. `SO_(3)^(2-)`

Answer

1

Explanation

`Pb^(2+)+2I^(-)rarrPbI_(2)darr("yellow"),Ag^(+)+I^(-)rarrAgI^(darr)("yellow")`
`3I^(-)+2NO_(2)^(-)+4H^(+)rarrI_(3)^(-)+2NOuarr+2H_(2)O`
`I_(2)+ "starch" rarr` blue colouration.