GATE CY topic:spectroscopy PYQs & Answers — Page 4

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topic:spectroscopy

Questions 31–40 of 52. Imported answers require independent review unless marked reviewed.

Topic practice 52 questionsPage 4 of 6

The number of signal(s) in the

H NMR spectrum of the following compound

recorded at 25 °C in CDCl₃ is __________.

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The number of photons emitted per nanosecond by a deuterium lamp (400 nm) having a power of 1 microwatt (rounded off to the nearest integer) is ______. [h = 6.626 × 10⁻³⁴ kg m² s⁻¹; c = 3.0 × 10⁸ m s⁻¹]

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The molar absorption coefficient of a substance dissolved in cyclohexane is 170 L mol⁻¹ cm⁻¹ at 500 nm. The reduction in intensity of light of the same wavelength that passes through a cell of 1 cm path length containing a 2 mol L⁻¹ solution (rounded off to one decimal place) is _________%.

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The fundamental vibrational frequency of ¹H¹²⁷I is 2309 cm⁻¹. The force constant for this molecule (rounded off to the nearest integer) is _____ N m⁻¹. [N = 6.022 × 10²³, c = 3.0 × 10⁸ m s⁻¹]

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A laser Raman spectrometer operating at 532 nm is used to record the vibrational spectrum of Cl₂ having its fundamental vibration at 560 cm⁻¹. The Stokes line corresponding to this vibration will be observed at ______ cm⁻¹. (Rounded off to the nearest integer)

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In the following reaction,

the number of peaks exhibited by the major product P in its broadband proton decoupled ¹³C NMR spectrum is ______

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In an NMR spectrometer operating at a magnetic field strength of 16.45 T, the resonance frequency (in MHz, rounded off to one decimal place) of

F nucleus is ______

(Given: g factor of

F = 5.255;

= 5.05 × 10

J T

; h = 6.626 × 10

J s)

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Fluorescence quantum yield and fluorescence lifetime of a molecule are 0.4 and 5 × 10

s, respectively. If the fluorescence decay rate constant is Y × 10

, the value of Y (rounded off to nearest integer) is ______

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Among the following,

the total number of compounds showing characteristic carbonyl stretching frequency less than 1700 cm

in their IR spectra is ______

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The frequency (in cm

, rounded off to two decimal places) for pure rotational line in the spectrum of NO molecule due to change in the quantum number from

is ______

(Given: Moment of inertia of NO =

kg m

;

J s;

m/s)

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GATE CY topic:spectroscopy PYQs

Question 23

Question 45

Question 48

Question 49

Question 50

Question 16

Question 21

Question 25

Question 45

Question 49