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MCQEasyJEE 2023Transition Elements Properties

JEE Chemistry 2023 Question with Solution

Match List I with List II

List I && List II

Complex && Colour

A. & Mg(NH4_4)PO4_4 & I. & Brown

B. & K3_3[Co(NO2_2)6_6] & II. & White

C. & MnO(OH)2_2 & III. & Yellow

D. & Fe4_4[Fe(CN)6_6]3_3 & IV. & blue

Choose the correct answer from the options Provided that below:

  • A

    A -- II, B -- III, C -- IV, D -- I

  • B

    A -- II, B -- IV, C -- I, D -- III

  • C

    A -- III, B -- IV, C -- II, D -- I

  • D

    A -- II, B -- III, C -- I, D -- IV

Answer

Correct answer:B

Step-by-step solution

Standard Method

Given: Match the complexes with their colours.

Find: The correct option containing the proper correspondence.

From the solution:

  • Mg(NH4)PO4\text{Mg(NH}_4\text{)PO}_4 is White.
  • K3[Co(NO2)6]\text{K}_3[\text{Co(NO}_2\text{)}_6] is Yellow.
  • MnO(OH)2\text{MnO(OH)}_2 is Brown.
  • Fe4[Fe(CN)6]3\text{Fe}_4[\text{Fe(CN)}_6]_3 is Blue.

So the matching is:

  • A →\to II
  • B →\to III
  • C →\to I
  • D →\to IV

This corresponds to option B in the given choices.

Therefore, the correct option is B.

Common mistakes

  • Confusing the option label with the list label. The source options are numbered, but the final MCQ labels here are A, B, C, D. Map option (2) to B correctly.

  • Mixing up Brown and Blue for MnO(OH)2\text{MnO(OH)}_2 and Fe4[Fe(CN)6]3\text{Fe}_4[\text{Fe(CN)}_6]_3. Prussian blue is characteristically blue, not brown.

  • Assuming all coordination compounds in the list are coloured. Mg(NH4)PO4\text{Mg(NH}_4\text{)PO}_4 is white, so direct recall of known compound colours is necessary.

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