During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in $\mathrm{NH}_{4} \mathrm{OH}$ solution when sodium carbonate extract was first acidified with dil. $\mathrm{HNO}_{3}$ and then $\mathrm{AgNO}_{3}$ solution was added. This indicates presence of:

JEE Main · 2024 · 06 Apr 2024 · Shift 2 · Practical and Analytical Chemistry

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in

NH_{4} OH

solution when sodium carbonate extract was first acidified with dil.

HNO_{3}

and then

AgNO_{3}

solution was added. This indicates presence of:

Answer: (A)

Acidifying the sodium-carbonate extract with dilute

HNO_{3}

removes carbonate interference; adding

AgNO_{3}

then precipitates the halide, whose colour and solubility in

NH_{4} OH

identify it: AgCl is white and dissolves readily even in dilute

NH_{4} OH

; AgBr is pale yellow and dissolves only with difficulty in concentrated

NH_{4} OH

; AgI is yellow and does not dissolve even in concentrated

NH_{4} OH

. A pale-yellow precipitate soluble with difficulty indicates

Br^{-}

JEE Main · 2024 · 06 Apr 2024 · Shift 2 · Single correct option