GATE CY Spectroscopy PYQs & Answers — Page 2

Questions 11–20 of 52. Imported answers require independent review unless marked reviewed.

The ratio of the fundamental vibrational frequencies

of two diatomic molecules

and

, considering their force constants to be the same, is_______ (rounded off to two decimal places).

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If a molecule emitting a radiation of frequency

Hz approaches an observer with a relative speed of

m s

, then the observer detects a frequency of _____

Hz. (rounded off to three decimal places)\n\n[Given: Speed of light

m s

]

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The molecule XY₂ is microwave active and its vibration-rotation spectrum shows only P and R transitions. In the correct structure,

Your answerChoose one option.

X is the central atom in linear XY₂.

X is the central atom in bent XY₂.

Y is the central atom in linear XY₂.

Y is the central atom in bent XY₂.

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The correct statement(s) about

state of an atom is (are):

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

it corresponds to

, and

it can originate from

electronic configuration.

it splits into five levels in the presence of magnetic field.

it can show spectral transition to

state.

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H NMR spectrum of a mixture containing CH

Br (

mol) and (CH

)

CBr (

mol) shows two singlets at 2.7 ppm and 1.8 ppm, with the relative ratio of 3:1 (integration value), respectively. The value of

is ____. (rounded off to the nearest integer)

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Consider the following

H-NMR (400 MHz, DMSO-d

) data of a compound:

in ppm: 3.85 (s, 6H), 6.73 (t, J = 2.2 Hz, 1H), 7.1 (d, J = 2.2 Hz, 2H), and 13.05 (brs, 1H).

The compound is

Your answerChoose one option.

Diagram for Chemistry question 40 (figure 2)

Diagram for Chemistry question 40 (figure 3)

Diagram for Chemistry question 40 (figure 4)

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Consider the following six vibrational modes:

symmetric stretching of CO₂, O-H symmetric stretching of H₂O, stretching of HCl, stretching of H₂, N-H symmetric stretching of NH₃, and bending of CO₂.

Among these modes, if k number of modes are IR active but Raman inactive, l number of modes are IR inactive but Raman active, and m number of modes are both IR and Raman active.

k, l, and m, respectively, are

Your answerChoose one option.

1, 3, and 2

3, 1, and 2

1, 2, and 3

2, 1, and 3

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Among the following, the NMR active nucleus(nuclei) is (are)

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

¹²C

¹⁹F

²H

¹⁶O

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Assertion (S): The total angular momentum for light atoms (low atomic number) is obtained by Russell-Saunders coupling, whereas jj-coupling is used for heavy atoms (high atomic number).

Reasoning (R): The spin-orbit interactions are weak in light atoms (low atomic number) and strong in heavy atoms (high atomic number).

The correct option is

Your answerChoose one option.

S and R are true; and R is the correct reason for S

S and R are true; but R is NOT the correct reason for S

S is true but R is false

S is false but R is true

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In the

H NMR spectrum, multiplicity of the signal (bold and underlined H atom) in the following species is

(I) [HNi(OPEt

)

]

(II) Ph

Si(Me)H (III) PH

(IV) (Cp*)

ZrH

(Cp* = pentamethylcyclopentadienyl)

Your answerChoose one option.

I- pentet, II- quartet, III- doublet and IV- singlet

I- pentet, II- singlet, III- singlet and IV- doublet

I- triplet, II- triplet, III- doublet and IV- doublet

I- singlet, II- quartet, III- singlet and IV- singlet

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GATE CY Spectroscopy PYQs

Question 34

Question 61

Question 20

Question 27

Question 32

Question 40

Question 45

Question 48

Question 30

Question 40