Qualitative Analysis - Result Question 32

####33. Statement I A very dilute acidic solution of Cd2+ and Ni2+ gives yellow precipitate of CdS on passing H2S.

Statement II Solubility product of CdS is more than that of NiS.

(1989, 2M)

Passage Based Questions

Passage 1

An aqueous solution of metal ion M1 reacts separately with reagents Q and R in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion M2 always forms tetrahedral complexes with these reagents. Aqueous solution of M2 on reaction with reagent S gives white precipitate which dissolves in excess of S. The reactions are summarised in the scheme given below

Tetrahedral Q excess M1 excess R Square planar

Tetrahedral QQ excess M2R excess  Tetrahedral

S, stoichiometric amount 

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Answer:

Correct Answer: 33. Fe3+

Solution:

  1. Cation Cd2+ belongs to group II while Ni2+ belongs to group III of analytical group. Group II radicals are precipitated by passing H2S(g) through acidic solution of salt but radicals of group III are precipitated by passing H2S(g) in NH3/NH4Cl buffer solution of salt due to greater solubility products of later salts.


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