Retro (Past 13 Year) IIT-JEE Advanced (D Block Elements)


5 Questions MCQ Test Chemistry for JEE Advanced | Retro (Past 13 Year) IIT-JEE Advanced (D Block Elements)


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QUESTION: 1

Which of the following will not be oxid ised by O3?

(2005, 0nly 0ne Optjon Correct Type)

Solution:

KMnO4 is itself a very strong oxidising agent, O3 cannot oxidise it.

QUESTION: 2

Which of the following pairs is expected to exhibit same colour in solution ?

(2005, Only One Option Correct Type)

Solution:

ln CuCI2,Cu2+ has d9 configuration, exhibit d-d transition and show colour.
Similarly, in VOCI2, V4+ has d1 configuration, can exhibit d-d transition and show colour.

QUESTION: 3

Reduction of the metal centre in aqueous permanganate ion involves

Solution:
*Multiple options can be correct
QUESTION: 4

Which of the following halides react(s) with AgNO(aq) to give a precipitate that dissolves in Na2S2O3(aq)?

(2012, One or More than One Options Correct Type)

Solution:

Solubilities of silver halides in water decreases from fluoride (AgF) to iodide (Agl). Silver fluoride is readily soluble in water hence, when AgNO3 solution is added to HF solution (HF being weak acid, its solution maintain very low concentration of F-) no precipitate of AgF is formed.
HCl, HBr and HI being all strong acid, forms precipitates of AgCI, AgBr and Agl when AgNO3 solution is added to their aqueous solution.


The solubilities decreases from AgCI to Agl, AgCI dissolves in aqueous ammonia, AgBr dissolves only slightly in concentrated ammonia while Agl does not dissolve in ammonia solution. Na2S2O3 solution dissolve all three, AgCI, AgBr, Agl by forming complex [Ag(S2O3)2]3- as is a stronger complexing agent than ammonia.

*Answer can only contain numeric values
QUESTION: 5

Consider the following list of reagents, acidified K2Cr2O7, alkaline KMnO4,CuSO4, H2O2, Cl2, O3, FeCI3, HNO3 and Na2S2O3. The total number of reagents that can oxidise aqueous iodide to iodine is

(2014 Adv., Integer Type)


Solution:

Acidified K2Cr2O7, CuSO4, H2O2, Cl2, O3, FeCI3 and HNO3 oxidise aqueous iodide to iodine. Alkaline KMnO4 oxidise aqueous iodide to 
Na2S2O3 is a strong reducing agent which on reaction with I2 produces I-.
Na2S2O3 + I2 → 2I- + Na2S4O6
Therefore, no reaction takes place between Na2S2Oand iodide ion.