Match List I with List II
List-I (Ion) List-II (Group Number in Cation Analysis)
A. Co2+ I. Group-I

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Question

Match List I with List II
List-I (Ion) List-II (Group Number in Cation Analysis)
A. Co2+ I. Group-I
B. Mg2+ II. Group-III
C. Pb2+ III. Group-IV
D. Al3+ IV. Group-VI
Choose the correct answer from the options given below :
(1) A-III, B-II, C-I, D-IV
(2) A-III, B-IV, C-II, D-I
(3) A-III, B-IV, C-I, D-II
(4) A-III, B-II, C-IV, D-I

Accepted Answer

Correct Answer: C — A-III, B-IV, C-I, D-IIStep-by-step Solution:A. Co²⁺ → Group-III (III): Precipitated as CoS (black) in Group III by H₂S in NH₄OH + NH₄Cl (alkaline medium).B. Mg²⁺ → Group-IV (IV): Precipitated as Mg(NH₄)PO₄ (white) using Na₂HPO₄ in Group V, but classified as Group IV in this scheme → precipitated as Mg₃(PO₄)₂ or MgNH₄PO₄.C. Pb²⁺ → Group-I (I): Precipitated as PbCl₂ (white) by dilute HCl in Group I.D. Al³⁺ → Group-III (II): Precipitated as Al(OH)₃ (white gelatinous) in Group III using NH₄OH + NH₄Cl.Key Concepts:Group I reagent: Dilute HCl → precipitates Pb²⁺, Hg₂²⁺, Ag⁺ as insoluble chlorides.Group III reagent: H₂S in NH₄OH/NH₄Cl (alkaline buffer) → precipitates Fe³⁺, Al³⁺, Cr³⁺ (hydroxides), Co²⁺, Ni²⁺ (sulphides).Group IV: Precipitates Ba²⁺, Sr²⁺, Ca²⁺, Mg²⁺ as carbonates/phosphates.

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