GATE CY topic:chemistry PYQs & Answers — Page 12

Questions 111–120 of 650. Imported answers require independent review unless marked reviewed.

The phase diagram of a single component system is given below.

The option with the correct number of degrees of freedom corresponding to the labelled points i, j, and k, respectively, is

Your answerChoose one option.

0, 1, 2

3, 2, 1

2, 0, 1

0, 2, 1

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An approximate partition function

of a gas is given below.

The equation of state(s) for this gas is/are

[Note:

is a parameter independent of volume.]

Your answerSelect all correct options. You can choose more than one.

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The compound(s) having structure similar to that of B₂H₆ is/are

Your answerSelect all correct options. You can choose more than one.

I₂Cl₆

Si₂Cl₆

Al₂Cl₆

Cl₂O₆

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The UV-visible spectrum of [Ni(en)₃]²⁺ (en = ethylenediamine) shows absorbance maxima at 1120 cm⁻¹, 1830 cm⁻¹, and 2900 cm⁻¹.

Absorbance maximum	Electronic transition
(a) 1120 cm⁻¹	(i) ³A₂g → ³T₁g (F)
(b) 1830 cm⁻¹	(ii) ³A₂g → ³T₂g
(c) 2900 cm⁻¹	(iii) ³A₂g → ³T₁g (P)

[Given: Atomic number of Ni = 28]

The correct match(es) between absorbance maximum and electronic transition is/are

Your answerSelect all correct options. You can choose more than one.

(a) → (ii)

(b) → (i)

(a) → (iii)

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Cytochrome P450 (CYP) enzymes catalyze stereoselective C–H hydroxylation of hydrocarbons in the presence of O₂. The correct statement(s) about the structure and activity of CYP is/are

Your answerSelect all correct options. You can choose more than one.

A thiolate group is coordinated to the Fe center at one of the axial positions around Fe.

While one of the oxygen atoms of O₂ is inserted into a C–H bond of a hydrocarbon, the other oxygen atom gets reduced to water.

An imidazole group is coordinated to the Fe center at one of the axial positions around Fe.

An iron-oxo species acts as a key oxidant in the catalytic cycle of CYP.

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The complex(es) having metal-metal bond order ≥3.5 is/are [Given: The atomic numbers of Mo, Cr, Mn, and Re are 42, 24, 25, and 75, respectively.]

Your answerSelect all correct options. You can choose more than one.

[Mo₂(μ-SO₄)₄(H₂O)₂]³⁻

[Mn₂(CO)₁₀]

[Cr₂(μ-O₂CCH₃)₄]

[Mo₂(μ-HPO₄)₄(H₂O)₂]²⁻

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Consider the following two reactions and their corresponding Hammett plots

Reaction M: Ar–C(CH₃)₂Cl →[S_N1, slow, kₓ] Ar–C⁺(CH₃)₂ →[H₂O, kₓ] Ar–C(CH₃)₂OH Reaction N: Ar–COOEt + OH⁻ →[H₂O, kₓ] Ar–COO⁻ + EtOH

Choose the option(s) that correctly match(es) the points on the graph given in Column-I with substituents X given in Column-II in accordance with their substituents constant σ

Your answerSelect all correct options. You can choose more than one.

s → σ_(X = Cl); t → σ_(X = OMe); u → σ_(X = NH₂); r → σ_(X = NO₂)

s → σ_(X = Me); u → σ_(X = NH₂); t → σ_(X = OMe); r → σ_(X = Br)

p → σ_(X = Me); q → σ_(X = CN); r → σ_(X = NO₂); t → σ_(X = OMe)

p → σ_(X = Cl); q → σ_(X = NO₂); r → σ_(X = CN); t → σ_(X = Me)

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