GATE CY topic:spectroscopy PYQs & Answers — Page 3

Questions 21–30 of 52. Imported answers require independent review unless marked reviewed.

A solution of three non-interacting compounds P, Q, and R is taken in a cuvette of 1 cm path length. Their concentrations are [P] = 1×10⁻⁶ M, [Q] = 2×10⁻⁶ M, [R] = 3×10⁻⁶ M and the molar extinction coefficients at 300 nm are εₚ = 1×10⁵ M⁻¹ cm⁻¹, εQ = 2×10⁵ M⁻¹ cm⁻¹ and εR = 3×10⁵ M⁻¹ cm⁻¹. The % transmittance at 300 nm is ______ (rounded off to two decimal places)

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The

resonance Raman stretching frequency (cm

) of the coordinated dioxygen in oxy-hemoglobin and oxy-hemocyanin appears, respectively, nearly at

Your answerChoose one option.

1136 and 744

1550 and 744

744 and 1136

744 and 1550

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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 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 the spectral line broadening in atomic spectra is(are)

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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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The number of peaks exhibited by T in its broadband proton decoupled

NMR spectrum recorded at 25 °C in CDCl₃ is

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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

Your answerChoose one option.

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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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

Your answerChoose one option.

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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The normal mode(s) of vibration of H₂O is/are:

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

Diagram for Chemistry question 18 (figure 2)

Diagram for Chemistry question 18 (figure 3)

Diagram for Chemistry question 18 (figure 4)

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GATE CY topic:spectroscopy PYQs

Question 65

Question 18

Question 21

Question 27

Question 29

Question 33

Question 44

Question 49

Question 50

Question 18