GATE CY Spectroscopy PYQs & Answers — Page 5

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Questions 41–50 of 52. Imported answers require independent review unless marked reviewed.

Topic practice 52 questionsPage 5 of 6

Assuming no interaction between vibrational and rotational energy levels in HF, the frequency (in cm

, rounded off to the nearest integer) of the R branch line originating from

in its IR spectrum is ______

(Given: Rotational constant for HF = 19.35 cm

;

)

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The number of ¹H NMR signals observed for the following compound is ______________.

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The number of CO stretching bands in IR spectrum of trigonal bipyramidal cis-M(CO)₃L₂ is ____________. (M = metal and L = monodentate ligand)

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In a 400 MHz ¹H NMR spectrometer, a proton resonates at 1560 Hz higher than that of tetramethylsilane. The chemical shift value of this proton is ____________ ppm. (Round off to one decimal place) (Chemical shift of tetramethylsilane is fixed at zero ppm)

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In the ¹H NMR spectrum of an organic compound recorded on a 300 MHz instrument, a proton resonates as a quartet at δ 4.20 ppm. The individual signals of the quartet appear at δ 4.17, 4.19, 4.21 and 4.23 ppm. The coupling constant J in Hz is _____.

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The absorption maxima of two dyes X and Y are 520 and 460 nm, respectively. The absorbance data of these dyes measured in a 1 cm path length cell are given in the table below.

Dye solution	Absorbance at 460 nm	Absorbance at 520 nm
X (9 mM)	0.144	0.765
Y (12 mM)	0.912	0.168
Mixture of X and Y	0.700	0.680

The concentration of Y in the mixture is ________ mM. (Up to two decimal places)

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The spacing between the two adjacent lines of the microwave spectrum of H³⁵Cl is 6.35 × 10¹¹ Hz. Given that the bond length of D³⁵Cl is 5% greater than that of H³⁵Cl, the corresponding spacing for D³⁵Cl is ______ × 10¹¹ Hz. (Up to two decimal places)

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For a diatomic vibrating rotor, in vibrational level

and rotational level J, the sum of the rotational and vibrational energies is 11493.6 cm⁻¹. Its equilibrium oscillation frequency is 2998.3 cm⁻¹, anharmonicity constant is 0.0124 and rotational constant under rigid rotor approximation is 9.716 cm⁻¹. The value of J is ____________. (Up to nearest integer)

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The strongest band observed in the IR spectrum of the final product of the following reaction appears, approximately, at _____ × 100 cm⁻¹. (Up to one decimal place)

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For ortho-hydrogen, the nuclear wavefunction and the rotational quantum number, respectively, are

Your answerChoose one option.

antisymmetric and even

symmetric and odd

symmetric and even

antisymmetric and odd

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GATE CY Spectroscopy PYQs

Question 51

Question 16

Question 17

Question 24

Question 24

Question 49

Question 51

Question 52

Question 55

Question 2