Metallurgy and Qualitative Analysis: Qualitative analysis MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow

Qualitative analysisMediumQuestion 900005

Question

H₂S in acidic medium precipitates which group of cations?

A
Group II (Cu²⁺, Pb²⁺, Bi³⁺, As³⁺, Sb³⁺, Sn²⁺, Cd²⁺)
Correct
B
Group I (Ag⁺, Pb²⁺, Hg₂²⁺)
C
Group III (Fe³⁺, Al³⁺, Cr³⁺)
D
Group IV (Zn²⁺, Mn²⁺, Ni²⁺)

Correct answer

Group II (Cu²⁺, Pb²⁺, Bi³⁺, As³⁺, Sb³⁺, Sn²⁺, Cd²⁺)

Explanation

Qualitative analysis groups: I — HCl precipitates Ag⁺, Pb²⁺, Hg₂²⁺. II — H₂S in dilute HCl (acidic) precipitates Cu²⁺, Pb²⁺, etc. (Ksp very small). III — (NH₄)₂S in NH₃ buffer precipitates Fe³⁺, Al³⁺, Cr³⁺ as hydroxides. IV — (NH₄)₂S in alkaline → ZnS, MnS, NiS, CoS. V — alkaline conditions → BaSO₄, CaCO₃. VI — Na, Mg remain.

Review Metallurgy and Qualitative Analysis notes Start timed chapter practice