GATE CY topic:chemistry PYQs & Answers — Page 31

Questions 301–310 of 650. Imported answers require independent review unless marked reviewed.

The major products M and N in the given reaction sequence are

Your answerChoose one option.

M =

Diagram for Chemistry question 41 (figure 2)

; N =

Diagram for Chemistry question 41 (figure 3)

M =

Diagram for Chemistry question 41 (figure 4)

; N =

Diagram for Chemistry question 41 (figure 5)

M =

Diagram for Chemistry question 41 (figure 6)

; N =

Diagram for Chemistry question 41 (figure 7)

M =

Diagram for Chemistry question 41 (figure 8)

; N =

Diagram for Chemistry question 41 (figure 9)

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Three different crystallographic planes of a unit cell of a metal are given below (solid circles represent atom). The crystal system of the unit cell is

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triclinic

monoclinic

tetragonal

orthorhombic

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The number of equivalents of H₂S gas released from the active site of rubredoxin, 2-iron ferredoxin, and 4-iron ferredoxin when treated with mineral acid, respectively, are

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4, 6, 8

0, 2, 4

1, 2, 4

0, 2, 3

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The number of νₛ=₀ stretching vibration band(s) observed in the IR spectrum of the high-spin [Mn(dmso)₆]³⁺ complex (dmso: dimethylsulfoxide) is

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only one

two with intensity ratio 1:2

two with intensity ratio 1:1

six with intensity ratio 1:1:1:1:1:1

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The rate constants in the given self-exchange electron transfer reactions at a certain temperature follow

[Fe(H₂O)₆]²⁺ + [Fe*(H₂O)₆]³⁺ ⟶ [Fe(H₂O)₆]³⁺ + [Fe*(H₂O)₆]²⁺

[Fe(bpy)₃]²⁺ + [Fe*(bpy)₃]³⁺ ⟶ [Fe(bpy)₃]³⁺ + [Fe*(bpy)₃]²⁺ (bpy = bipyridyl)

[Co(NH₃)₆]²⁺ + [Co*(NH₃)₆]³⁺ ⟶ [Co(NH₃)₆]³⁺ + [Co*(NH₃)₆]²⁺

indicates a radioactive isotope

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The CORRECT distribution of the products in the following reaction is

CH₃C(=O)Mn(CO)₅, with one ¹³CO ligand, heated (△), decarbonylation.

Your answerChoose one option.

Diagram for Chemistry question 46 (figure 2)

Two product structures: first has CH₃ above Mn, three CO ligands and one ¹³CO ligand; 25% + second has CH₃ above Mn, three CO ligands and one ¹³CO ligand; 75%.

Diagram for Chemistry question 46 (figure 3)

Two product structures: first has CH₃ above Mn, three CO ligands and one ¹³CO ligand; 20% + second has CH₃ above Mn, three CO ligands and one ¹³CO ligand; 80%.

Diagram for Chemistry question 46 (figure 4)

Three product structures: CO above Mn, CH₃ at upper right, and other CO ligands; 25% + CO above Mn, CH₃ at lower left and ¹³CO at upper right; 25% + CO above Mn, CH₃ at upper left and ¹³CO at upper right; 50%.

Diagram for Chemistry question 46 (figure 5)

Three product structures: CO above Mn, CH₃ at upper right, and other CO ligands; 20% + CO above Mn, CH₃ at lower left and ¹³CO at upper right; 20% + CO above Mn, CH₃ at upper left and ¹³CO at upper right; 60%.

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The addition of K₄[Fe(CN)₆] to a neutral aqueous solution of the cationic species of a metal produces a brown precipitate that is insoluble in dilute acid. The cationic species is

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Fe³⁺

UO₂²⁺

Th⁴⁺

Cu²⁺

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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:

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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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In the following table, the left column represents the rigid-rotor type and the right column shows a set of molecules.

Label	Rigid rotor type	Label	Molecule
P	Symmetric rotor (oblate)	1	SiH₄
Q	Symmetric rotor (prolate)	2	CH₃Cl
R	Spherical rotor	3	C₆H₆
S	Asymmetric rotor	4	CH₃OH
		5	CO₂

The CORRECT match is

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P-1, Q-2, R-3, S-4

P-3, Q-2, R-1, S-4

P-3, Q-5, R-1, S-2

P-5, Q-4, R-3, S-2

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The CORRECT statement regarding the following three normal modes of vibration of

(I)

(II)

Diagram for Chemistry question 50 (figure 2)

“+” and “−” indicate out-of-plane motion.

(III)

Diagram for Chemistry question 50 (figure 3)

Your answerChoose one option.

(I) and (II) are inferred active while (III) is inferred inactive

(I) is inferred inactive while (II) and (III) are inferred active

(I) and (III) are inferred inactive while (II) is inferred active

None of the modes are inferred active since

has zero dipole moment

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GATE CY topic:chemistry PYQs

Question 41

Question 42

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50