Practical Chemistry Question 3
Question 3 - 2024 (29 Jan Shift 2)
On passing a gas, ’ $X$ ‘, through Nessler’s reagent, a brown precipitate is obtained. The gas ’ $X$ ’ is
(1) $H _2 S$
(2) $CO _2$
(3) $NH _3$
(4) $Cl _2$
Show Answer
Answer (3)
Solution
Nessler’s Reagent Reaction :
$\underset{\text{Nessler Reagent}}{2 K _2 HgI _4}+NH _3+3 KOH \rightarrow \underset{\substack{\text{odine of Million’s base}\ \text{Brown precipate}}}{HgO . Hg\left(NH _2\right) I}+7 KI+2 H _2 O$
