Consider the following reactions. PbCl 2 + K 2 CrO 4 rightarrow A +2 KCl (Hot solution) A + NaOH rightleftharpoons B + Na 2 CrO 4 PbSO 4 +4 CH 3 COONH 4 rightarrow ( NH 4 ) 2 SO 4 + X In the above reactions, A , B and X are respectively.

PbCrO 4 , Na 2 [ Pb ( OH ) 4 ] and ( NH 4 ) 2 [ Pb ( CH 3 COO ) 4 ]

Na 2 [ Pb ( OH ) 2 ], PbCrO 4 and ( NH 4 ) 2 [ Pb ( CH 3 COO ) 4 ]

PbCrO 4 , Na 2 [ Pb ( OH ) 4 ] and [ Pb ( NH 3 ) 4 ] SO 4

Na 2 [ Pb ( OH ) 2 ], PbCrO 4 and [ Pb ( NH 3 ) 4 ] SO 4

Chemistry · Alkali Metals - Group 1

JEE Main 2026 — 21 January, Morning Shift — Question 48

Consider the following reactions.

$\mathrm{PbCl}_{2}+\mathrm{K}_{2} \mathrm{CrO}_{4} \rightarrow \mathrm{~A}+2 \mathrm{KCl}$ (Hot solution)

$\mathrm{A}+\mathrm{NaOH} \rightleftharpoons \mathrm{B}+\mathrm{Na}_{2} \mathrm{CrO}_{4}$

$\mathrm{PbSO}_{4}+4 \mathrm{CH}_{3} \mathrm{COONH}_{4} \rightarrow\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}+\mathrm{X}$

In the above reactions, $\mathrm{A}, \mathrm{B}$ and X are respectively.

Option A:
$\mathrm{Na}_{2}\left[\mathrm{~Pb}(\mathrm{OH})_{2}\right], \mathrm{PbCrO}_{4}$ and $\left(\mathrm{NH}_{4}\right)_{2}\left[\mathrm{~Pb}\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{4}\right]$
Option B:
$\mathrm{PbCrO}_{4}, \mathrm{Na}_{2}\left[\mathrm{~Pb}(\mathrm{OH})_{4}\right]$ and $\left[\mathrm{Pb}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{SO}_{4}$
Option C:
$\mathrm{Na}_{2}\left[\mathrm{~Pb}(\mathrm{OH})_{2}\right], \mathrm{PbCrO}_{4}$ and $\left[\mathrm{Pb}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{SO}_{4}$
Option D:
$\mathrm{PbCrO}_{4}, \mathrm{Na}_{2}\left[\mathrm{~Pb}(\mathrm{OH})_{4}\right]$ and $\left(\mathrm{NH}_{4}\right)_{2}\left[\mathrm{~Pb}\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{4}\right]$
Correct

Answer: D

Step-by-step solution

$\underset{\text { (Hot solution) }}{\mathrm{PbCl}_{2}}+\mathrm{K}_{2} \mathrm{CrO}_{4} \rightarrow \underset{\text { (A) }}{\mathrm{PbCrO}_{4}}+2 \mathrm{KCl}$

\begin{aligned} \mathrm{PbCrO}_{4}+4 \mathrm{NaOH} & \text { (excess) } & \rightarrow \mathrm{Na}_{2}\left[\mathrm{~Pb}(\mathrm{OH})_{4}\right]+\mathrm{Na}_{2} \mathrm{CrO}_{4} \end{aligned}

\begin{aligned} \mathrm{PbSO}_{4} & +4 \mathrm{CH}_{3} \mathrm{COONH}_{4} & \rightarrow\left(\mathrm{NH}_{4}\right)_{2}\left[\mathrm{~Pb}\left(\underset{(\mathrm{X})}{\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{4}}\right]+\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}\right. \end{aligned}

Answer key and solution verified before publishing.

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Exam: JEE Main 2026
Paper: 21 January, Morning Shift
Subject: Chemistry
Chapter: Alkali Metals - Group 1
Topic: Compounds of Sodium