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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceAssertion–reasonMediumConceptual

JEE Main 11 April 2023, Shift 2, Chemistry Q70

Question 70 of 90 in this shift, Chemistry question 10 of 30, Section A.

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : [CoCl(NH3)5]2+\mathrm{[CoCl(NH_3)_5]^{2+}} absorbs at lower wavelength of light with respect to [Co(NH3)5 (H2O)]3+\mathrm{[Co(NH_3)_5\ (H_2O)]^{3+}} Reason R : It is because the wavelength of the 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:
  1. (1)Both A and R are true and R is the correct explanation of A
  2. (2)Both A and R are true but R is NOT the correct explanation of A
  3. (3)A is true but R is false
  4. (4)A is false but R is trueOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Coordination Compounds
Topic
Crystal Field Theory
Idea tested
Color and d-d Transitions

Same idea in other shifts

Asked 5× in all
  1. 3 Apr 2025, Shift 1 · Q63The correct order of the complexes [Co(NH3)5(H2O)]3+\mathrm{[Co(NH_3)_5(H_2O)]^{3+}} (A), [Co(NH3)6]3+\mathrm{[Co(NH_3)_6]^{3+}} (B), [Co(CN)6]3−\mathrm{[Co(CN)_6]^{3-}}…MediumSingle correct
  2. 1 Feb 2024, Shift 1 · Q69Given below are two statements : Statement (I) : A solution of [Ni(H2O)6]2+\mathrm{[Ni(H_2O)_6]^{2+}} is green in colour. Statement (II) : A…MediumTwo statements
  3. 25 Jul 2022, Shift 1 · Q86Consider the following metal complexes : [Co(NH3)6]3+[\mathrm{Co(NH_3)_6}]^{3+} [CoCl(NH3)5]2+[\mathrm{CoCl(NH_3)_5}]^{2+} [Co(CN)6]3−[\mathrm{Co(CN)_6}]^{3-}…MediumNumerical value
  4. 16 Mar 2021, Shift 2 · Q59[Ti(H2O)6]3+\mathrm{[Ti(H_2O)_6]^{3+}} absorbs light of wavelength 498 nm during a d-d transition. The octahedral splitting energy for the above…EasyNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.