GATE CY topic:transition-elements PYQs & Answers — Page 3

Questions 21–30 of 43. Imported answers require independent review unless marked reviewed.

The electronic spectrum of a Ni(II) octahedral complex shows four d-d bands, labelled as P, Q, R, and S. Match the bands corresponding to the transitions.

Band	λmax, nm (ε, M⁻¹ cm⁻¹)	Transition
P	1000 (50)	I: ³A₂g(F) → ³T₁g(P)
Q	770 (8)	II: ³A₂g(F) → ³T₁g(F)
R	630 (55)	III: ³A₂g(F) → ³T₂g(F)
S	375 (110)	IV: ³A₂g(F) → ¹E_g(D)

The matching choices are:

Your answerChoose one option.

P-IV, Q-II, R-III, S-I

P-II, Q-IV, R-II, S-I

P-II, Q-IV, R-I, S-III

P-I, Q-IV, R-II, S-III

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The reaction of NiBr₂ with two equivalents of PPh₃ in CS₂ at −78 °C gives a red-colored diamagnetic complex, [NiBr₂(PPh₃)₂]. This transforms to a green-colored paramagnetic complex with the same molecular formula at 25 °C. The geometry and the number of unpaired electrons in the green-colored complex, respectively, are:

Your answerChoose one option.

tetrahedral and 1

tetrahedral and 2

square planar and 2

square planar and 4

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The rate of the substitution reaction of [Co(CN)₅Cl]³⁻ with OH⁻ to give [Co(CN)₅(OH)]³⁻

Your answerChoose one option.

depends on the concentrations of both [Co(CN)₅Cl]³⁻ and OH⁻

depends on the concentration of [Co(CN)₅Cl]³⁻ only

is directly proportional to the concentration of OH⁻ only

is inversely proportional to the concentration of OH⁻

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The Δ₀ of [Cr(H₂O)₆]³⁺, [CrF₆]³⁻ and [Cr(CN)₆]³⁻ follows the order:

Your answerChoose one option.

[Cr(H₂O)₆]³⁺ > [CrF₆]³⁻ > [Cr(CN)₆]³⁻

[CrF₆]³⁻ > [Cr(H₂O)₆]³⁺ > [Cr(CN)₆]³⁻

[Cr(CN)₆]³⁻ > [Cr(H₂O)₆]³⁺ > [CrF₆]³⁻

[CrF₆]³⁻ > [Cr(CN)₆]³⁻ > [Cr(H₂O)₆]³⁺

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The spin-only magnetic moment of [Co(H₂O)₆]²⁺ (rounded off to one decimal place) is ______ BM.

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The geometry and the number of unpaired electrons in tetrakis(1-norbornyl)Co

respectively, are:

Your answerChoose one option.

tetrahedral and one

tetrahedral and five

square planar and one

square planar and three

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The yellow color of an aqueous solution of K₂CrO₄ changes to red-orange upon the addition of a few drops of HCl. The red-orange complex, the oxidation state of its central element(s), and the origin of its color, respectively, are:

Your answerChoose one option.

chromium chloride, +3, d-d transition

dichromate ion, +6 and +6, charge transfer

perchlorate ion, +7, charge transfer

chromic acid, +6, charge transfer

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The correct order of increasing intensity (molar absorptivity) of the UV-visible absorption bands for the ions [Ti(H₂O)₆]³⁺, [Mn(H₂O)₆]²⁺, [CrO₄]²⁻, and [NiCl₄]²⁻ is:

Your answerChoose one option.

[Ti(H₂O)₆]³⁺ < [Mn(H₂O)₆]²⁺ < [CrO₄]²⁻ < [NiCl₄]²⁻

[Mn(H₂O)₆]²⁺ < [Ti(H₂O)₆]³⁺ < [NiCl₄]²⁻ < [CrO₄]²⁻

[NiCl₄]²⁻ < [Ti(H₂O)₆]³⁺ < [Mn(H₂O)₆]²⁺ < [CrO₄]²⁻

[Ti(H₂O)₆]³⁺ < [NiCl₄]²⁻ < [CrO₄]²⁻ < [Mn(H₂O)₆]²⁺

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The maximum number of microstates for

electronic configuration is ______

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In the electronic absorption spectrum of an aqueous solution of [Ni(NH₃)₆]²⁺, a very weak band is observed between the bands due to the transitions ³A₂g → ³T₂g and ³A₂g → ³T₁g(F). The transition responsible for the very weak band is (Given: atomic number of Ni is 28)

Your answerChoose one option.

³A₂g → ¹T₁g

³A₂g → ¹T₂g

³A₂g → ¹E_g

³A₂g → ¹A₂g

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GATE CY topic:transition-elements PYQs

Question 48

Question 12

Question 13

Question 14

Question 25

Question 26

Question 27

Question 42

Question 18

Question 34