IIT-JEE-Chemistry-Final Revision Set No.90

1. Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is

(A) 3

(B) 4

(C) 5

(D) 6

2.The correct statement(s) regarding defects in solids is(are)

(A) Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion

(B) Frenkel defect is a dislocation defect

(C) Trapping of an electron in the lattice leads to the formation of F-center

(D) Schottky defects have no effect on the physical properties of solids


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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 colouration due to the formation of methylene blue. Treatment of the aqueous solution of Y with the reagent potassium hexcyanoferrate (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 colouration due to the formation of Z.

3. The compound X is

(A) NaNO3

(B) NaCl

(C) Na2SO4

(D) Na2S

4. The compound Y is

(A) MgCI2

(B) FeCI2

(C) FeCI3

(D) ZnCI2

5. The compound Z is

(A) Mg2[Fe(CN)6]

(B) Fe[Fe(CN)6]

(C) Fe4[Fe(CN)6]3

(D) K2Zn3[Fe(CN)6]2


Source JEE 2009 Paper 1