JEE Main · 2025 · 22 Jan 2025 · Shift 1 · Practical and Analytical Chemistry

Consider the following reactions.
${\mathrm{PbCl}}_2+{\mathrm{K}}_2{\mathrm{CrO}}_4\to \mathrm{A}+2\mathrm{KCl}$ (Hot solution)
$\mathrm{A}+\mathrm{NaOH}\rightleftharpoons \mathrm{B}+{\mathrm{Na}}_2{\mathrm{CrO}}_4$ …

In Carius method, 0.75 g of an organic compound gave 1.2 g of barium sulphate, find percentage of sulphur (molar mass $32\mathrm{g}{\mathrm{mol}}^{-1}$). Molar mass of barium sulphate is $233\mathrm{g}{\mathrm{mol}}^{-1}$.

Sodium fusion extract of an organic compound (Y) with ${\mathrm{CHCl}}_3$ and chlorine water gives violet color to the ${\mathrm{CHCl}}_3$ layer. 0.15 g of $(\mathrm{Y})$ gave 0.12 g of the silver halide precipitate in Carius method. Percentage of halogen in the compound …

When 1 g of compound ( X ) is subjected to Kjeldahl's method for estimation of nitrogen, 15 $\mathrm{mL},1\mathrm{M}{\mathrm{H}}_2{\mathrm{SO}}_4$ was neutralized by ammonia evolved. The percentage of nitrogen in compound $(\mathrm{X})$ is :

Identify the correct statements:
A. Hydrated salts can be used as primary standard.
B. Primary standard should not undergo any reaction with air.
C. Reactions of primary standard with another substance should be instantaneous and stoichiometric.
D. Primary standard should not be …

Match List-I with List-II.

List-I: Functional group (detection)
(A) Unsaturation (Baeyer's test)
(B) Alcoholic group (Ceric ammonium nitrate test)
(C) Aldehyde group (Tollen's reagent)
(D) Phenolic group ($\mathrm{FeCl}{}_3$ test)

List-II: Change observed during detection
(I) Red co …