GATE CY purpose:exam-prep PYQs & Answers — Page 29

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Questions 281–290 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 29 of 65

The pure vibrational spectrum of a hypothetical diatomic molecule shows three peaks with the following intensity at three different temperatures.

Peak	300 K	600 K	900 K
I	1.0	1.0	1.0
II	0.1	0.1	0.1
III	0.02	0.04	0.06

The CORRECT statement is

Your answerChoose one option.

Peak I appears at the lowest energy

Peak II appears at the lowest energy

Peak III appears at the lowest energy

Peak I appears at the highest energy

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The point group of SF

Your answerChoose one option.

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A point originally at

was subjected to a symmetry operation

that shifted the point to

. Subsequently, the point at

was subjected to another symmetry operation

that shifted this point to

. The symmetry operators

and

are, respectively,

Your answerChoose one option.

and

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Adsorption of a gas with pressure

on a solid obeys the Langmuir adsorption isotherm. For a fixed fractional coverage, the correct relation between

and

at a fixed temperature is

[

and

are the rate constants for adsorption and desorption, respectively. Assume non-dissociative adsorption.]

Your answerChoose one option.

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The temperature dependence of the rate constant for a second-order chemical reaction obeys the Arrhenius equation. The SI unit of the ‘pre-exponential factor’ is

Your answerChoose one option.

mol

mol m

mol

)

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The CORRECT reagent(s) for the given reaction is(are)

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

, NaOH

Diagram for Chemistry question 26 (figure 2)

DIBAL-H, then mCPBA

·pyridine, Me

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The CORRECT statement(s) about the

H NMR spectra of compounds P and Q is(are)

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

P shows a sharp singlet at

ppm (for H

and H

)

Q shows a sharp singlet at

ppm (for H

and H

)

P shows an AB-quartet centered at

ppm (for H

and H

)

Q shows an AB-quartet centered at

ppm (for H

and H

)

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The CORRECT statement(s) about thallium halides is(are)

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

TlF is highly soluble in water whereas other Tl-halides are sparingly soluble

TlF adopts a distorted NaCl structure

TlI

is isomorphic with CsI

and the oxidation state of Tl is +3

Both TlBr and TlCl have CsCl structure

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The CORRECT statement(s) about the spectral line broadening in atomic spectra is(are)

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

The collision between atoms causes broadening of the spectral line

Shorter the lifetime of the excited state, the broader is the line width

Doppler broadening is more pronounced as the flame temperature increases

In flame and plasma, the natural line broadening exceeds the collisional line broadening

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Match the CORRECT option(s) from column A with column B according to the metal centre present in the active site of metalloenzyme.

A		B
P	Cu	I	B -coenzyme
Q	Mo	II	Carboxypeptidase
R	Co	III	Nitrate reductase
S	Zn	IV	Cytochrome P-450
		V	Tyrosinase

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

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

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

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

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

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GATE CY purpose:exam-prep PYQs

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