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JEE Main 20257 AprilMorning Shift

Exam: JEE Main
Year: 2025
Date: 7 April
Shift: Morning Shift
Subject: Chemistry
Chapter: Practical Chemistry

JEE Main 2025 · 7 April · Morning Shift · Chemistry · Practical Chemistry

When a salt is treated with sodium hydroxide solution it gives gas...

When a salt is treated with sodium hydroxide solution it gives gas

\mathrm{X}

. On passing gas

\mathrm{X}

through reagent

\mathrm{Y}

a brown coloured precipitate is formed.

\mathrm{X}

and

\mathrm{Y}

respectively, are When a salt is treated with sodium hydroxide solution it gives gas X . On passing gas X through reagent Y a brown

When a salt is treated with sodium hydroxide solution it gives gas X . On passing gas X through reagent Y a brown

Options

A $\mathrm{X}=\mathrm{NH}_3$ and $\mathrm{Y}=\mathrm{HgO}$
B $\mathrm{X}=\mathrm{NH}_3$ and $\mathrm{Y}=\mathrm{K}_2 \mathrm{HgI}_4+\mathrm{KOH}$
C $\mathrm{X}=\mathrm{NH}_4 \mathrm{Cl}$ and $\mathrm{Y}=\mathrm{KOH}$
D $\mathrm{X}=\mathrm{HCl}$ and $\mathrm{Y}=\mathrm{NH}_4 \mathrm{Cl}$

Correct answer

B. $\mathrm{X}=\mathrm{NH}_3$ and $\mathrm{Y}=\mathrm{K}_2 \mathrm{HgI}_4+\mathrm{KOH}$

Step-by-step solution

\mathrm{NH}_4^{+}+\mathrm{NaOH} \longrightarrow \mathrm{H}_2 \mathrm{O}+\mathrm{NH}_3 \uparrow

<br /><img src="https://cdn-question-pool.Quantrex.app/pyq/jee_main/zlgVoLdTpziORH65aQ1uy2tTAdVeTZrPImGlJs1cJ0o.original.fullsize.png"/><br />

\mathrm{NH}_3

is identify by

\mathrm{K}_2

\left[\mathrm{HgI}_4\right]+\mathrm{KOH}

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