Test: Comprehension Based Questions: Analytical Chemistry


7 Questions MCQ Test Class 12 Chemistry 35 Years JEE Mains &Advance Past yr Paper | Test: Comprehension Based Questions: Analytical Chemistry


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Attempt Test: Comprehension Based Questions: Analytical Chemistry | 7 questions in 10 minutes | Mock test for JEE preparation | Free important questions MCQ to study Class 12 Chemistry 35 Years JEE Mains &Advance Past yr Paper for JEE Exam | Download free PDF with solutions
QUESTION: 1

PASSAGE-1
p-Amino-N, N-dimethylaniline is added to a strongly acidic solution of  X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue coloration due to the formation of methylene blue. Treatment of the aqueous solution of Y with the reagent potassium hexacyanoferrate(II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown coloration due to the formation of Z. (2009)

Q. The compound X is 

Solution:

Reaction of Y indicates that it is Fe3+ salt.

NOTE : since the product formed (methylene blue) has sulphur in its structure, it should be supplied by the compound X which is thus Na2S.

Thus

QUESTION: 2

PASSAGE-1
p-Amino-N, N-dimethylaniline is added to a strongly acidic solution of  X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue coloration due to the formation of methylene blue. Treatment of the aqueous solution of Y with the reagent potassium hexacyanoferrate(II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown coloration due to the formation of Z. (2009)

Q. The compound  Y is

Solution:

Reaction of Y indicates that it is Fe3+ salt.

NOTE : since the product formed (methylene blue) has sulphur in its structure, it should be supplied by the compound X which is thus Na2S.

Thus

QUESTION: 3

PASSAGE-1
p-Amino-N, N-dimethylaniline is added to a strongly acidic solution of  X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue coloration due to the formation of methylene blue. Treatment of the aqueous solution of Y with the reagent potassium hexacyanoferrate(II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown coloration due to the formation of Z. (2009)

Q. The compound Z is

Solution:

Reaction of Y indicates that it is Fe3+ salt.

NOTE : since the product formed (methylene blue) has sulphur in its structure, it should be supplied by the compound X which is thus Na2S.

Thus

QUESTION: 4

PASSAGE-2
An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and a 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. (JEE Adv. 2013-II)

Q. The precipitate P contains  

Solution:

Lead salts give white precipitate of PbCl2 with dil. HCl which is soluble in hot water.

  (White ppt) soluble in hot water.

QUESTION: 5

PASSAGE-2
An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and a 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. (JEE Adv. 2013-II)

Q. The coloured solution S contains

Solution:

The filtrate on treatment with ammoniacal H2S gives a precipitate which dissolves in aqueous NaOH containing H2O2 giving a coloured solution. It contains Cr3+ ion.

QUESTION: 6

PASSAGE-3
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 summarized in the scheme given below:

Scheme:

6. M1, Q and R, respectively are (JEE Adv. 2014)  

Solution:

QUESTION: 7

PASSAGE-3
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 summarized in the scheme given below:

Scheme:

Q. Reagent S is (JEE Adv. 2014)

Solution:

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