Question

Sodium carbonate extract of the salt is acidified with $dil.HN{O}_3$ and $AgN{O}_3$ solution is added to it. A yellow yellow precipitate insoluble in excess $N{H}_{4}OH$ confirms the presence of :

• A. $F^{-}$
• B. $C{l}^{-}$
• C. $B{r}^{-}$
• D. $I^{-}$

Answer 1

The correct option is D $I^{-}$

When sodium carbonate extract of the salt is acidified with $dil.HN{O}_3$ and $AgN{O}_3$ solution is added to it , a yellow yellow precipitate of $AgI$ which insoluble in excess $N{H}_{4}OH$ confirms the presence of iodide ions.
$NaI+AgN{O}_3\to NaN{O}_3+\underset{\text{Yellow ppt.}}{AgI}$