Principles of Qualitative Analysis

Which of the following compounds is/are yellow in colour? (memory based jee mains shift-2 28/01/2025)

\(\left(\mathrm{a}\right)\mathrm{CdS}\\ \left(\mathrm{b}\right)\mathrm{PbS}\\ \left(\mathrm{c}\right)\mathrm{CuS}\\ \left(\mathrm{d}\right)\mathrm{ZnS}(\mathrm{cold})\\ \left(\mathrm{e}\right){\mathrm{PbCrO}}_{4}\)

Which of the following is yellow colored? (memory based jee mains shift-2 24/01/2025)

Identify the inorganic sulphides that are yellow in colour :
(A) \({\left(N{H}_{4}\right)}_{2}S\)
(B) PbS
(C) CuS
(D) \(A{s}_{2}{S}_{3}\)
(E) \(A{s}_{2}{S}_{5}\)

Choose the correct answer from the options given below

[JEE Main 2025, 28 Jan (Shift 2)]

Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to VI.

A. \(A{l}^{3+}\)

B. \(C{u}^{2+}\)

C. \(B{a}^{2+}\)

D. \(C{o}^{2+}\)

E: \(M{g}^{2+}\)

Choose the correct answer from the options given below:

Why \({\mathrm{NH}}_{4}\mathrm{Cl}\) is added before \({\mathrm{NH}}_{4}\mathrm{OH}\) for the ppt. of \({\mathrm{Fe}}^{3+}\) ions?

Which of the following is yellow colored? (memory based jee mains shift-2 24/01/2025)

During sodium nitroprusside test of sulphide ion in an aqueous solution, one of the ligands coordinated to the metal ion is converted to

[JEE Advanced 2025, Paper-2]

Which of the following compounds is/are yellow in colour? (memory based jee mains shift-2 28/01/2025)

\(\left(\mathrm{a}\right)\mathrm{CdS}\\ \left(\mathrm{b}\right)\mathrm{PbS}\\ \left(\mathrm{c}\right)\mathrm{CuS}\\ \left(\mathrm{d}\right)\mathrm{ZnS}(\mathrm{cold})\\ \left(\mathrm{e}\right){\mathrm{PbCrO}}_{4}\)

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is