Chemistry · Practical Inorganic chemistry (Qualitative Analysis)

JEE Advanced 2021 — Paper 1 — Question 18

A mixture of two salts is used to prepare a solution S , which gives the following results: The correct option(s) for the salt mixture is(are)

Option A:
$\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}$ and $\mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}$
Correct
Option B:
$\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}$ and $\mathrm{Bi}\left(\mathrm{NO}_{3}\right)_{3}$
Correct
Option C:
$\mathrm{AgNO}_{3}$ and $\mathrm{Bi}\left(\mathrm{NO}_{3}\right)_{3}$
Correct
Option D:
$\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}$ and $\mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2}$

Answer: A, B, C

$\mathrm{Pb}(\mathrm{OH})_{2}, \mathrm{Zn}(\mathrm{OH})_{2}$ and $\mathrm{Bi}(\mathrm{OH})_{3}$

are white precipitates but $\mathrm{Hg}(\mathrm{OH})_{2}$ (unstable) is not. $\mathrm{PbCl}_{2}$

is white ppt. So, option (A), (B) and (C) are correct.

Answer key and solution verified before publishing.

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