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JEE Main 202311 AprilEvening Shift
Exam
JEE Main
Year
2023
Date
11 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Coordination Compounds

JEE Main 2023 · 11 April · Evening Shift · Chemistry · Coordination Compounds

Given below are two statements, one is labelled as assertion A and...

Given below are two statements, one is labelled as assertion AA and the other is labelled as Reason RR.
assertion AA : [CoCl(NH3)5]2+{\left[CoCl{\left({NH}_{3}\right)}_{5}\right]}^{2 +} absorbs at lower wavelength of light with respect to [Co(NH3)5(H2O)]3+{\left[Co{\left({NH}_{3}\right)}_{5}\left({H}_{2}O\right)\right]}^{3 +}
Reason RR: It is because the wavelenght of light absorbed depends on the oxidation state of the metal ion.
In the light of the above statements,choose the correct answer from the options given below:

Options

  1. AAA is false but RR is true
  2. BAA is true but RR is false
  3. CBoth AA and RR are true and RR is the correct explaination of AA
  4. DBoth AA and RR are true and RR is NOT the correct explaination of AA

Correct answer

A. AA is false but RR is true

Step-by-step solution

[CoCl(NH3)5]2+{\left[CoCl{\left({NH}_{3}\right)}_{5}\right]}^{2 +}absorbs with higher wavelength of light with respect to [Co(NH3)5(H2O)]3+{\left[Co{\left({NH}_{3}\right)}_{5}\left({H}_{2}O\right)\right]}^{3 +} because Cl−{Cl}^{-} is weaker ligand than H2O{H}_{2}O. The crystal field stabilisation is higher for [Co(NH3)5(H2O)]3+{\left[Co{\left({NH}_{3}\right)}_{5}\left({H}_{2}O\right)\right]}^{3 +}, hence we can say that wavelength of light absorbed depends upon the oxidation state of the metal ion.
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