Qualitative Analysis - Result Question 34

####35. Reagent S is

(a) K4[Fe(CN)6]

(b) Na2HPO4

(c) K2CrO4

(d) KOH

Passage 2

An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and filtrate (Q). The precipitate (P) was found to dissolve in hot water. The filtrate (Q) remained unchanged, when treated with H2S in a dilute mineral acid medium. However, it gave a precipitate (R) with H2S in an ammoniacal medium. The precipitate R gave a coloured solution (S), when treated with H2O2 in an aqueous NaOH medium.

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Answer:

Correct Answer: 35. (b,c)

Solution:

  1. Zn2+ on treatment with excess of KOH produces [Zn(OH)4]2.

36, 37. PLAN PbCl2 is soluble in hot water.

In ammoniacal medium, cations of group III and IV may be precipitated as hydroxide or sulphide and dissolved in H2O2 due to oxidation.

 Mixture of two inorganic salts  (ii) Filter  (i) HCl

Thus, Q. 35. P is Pb2+. Q. 36. S is Na2CrO4.



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