GATE CY topic:instrumental-methods-analysis PYQs & Answers

Questions 1–10 of 17. Imported answers require independent review unless marked reviewed.

The correct statement(s) about Mössbauer spectroscopy of iron compounds is(are)

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⁵⁷Co is used as a source

Their Mössbauer spectra are obtained using γ-ray with resonance energy of 14.4 keV

K₂[Fe(CN)₅NO] shows large quadrupole splitting

Isomer shift of FeSO₄·7H₂O is smaller than that of K₃[Fe(CN)₆]

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Compound(s) that show(s) an intense peak at m/z 120 in the EI mass spectrum is/are

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Diagram for Chemistry question 24 (figure 2)

Diagram for Chemistry question 24 (figure 3)

Diagram for Chemistry question 24 (figure 4)

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The UV-visible spectrum of [Ni(en)₃]²⁺ (en = ethylenediamine) shows absorbance maxima at 1120 cm⁻¹, 1830 cm⁻¹, and 2900 cm⁻¹.

Absorbance maximum	Electronic transition
(a) 1120 cm⁻¹	(i) ³A₂g → ³T₁g (F)
(b) 1830 cm⁻¹	(ii) ³A₂g → ³T₂g
(c) 2900 cm⁻¹	(iii) ³A₂g → ³T₁g (P)

[Given: Atomic number of Ni = 28]

The correct match(es) between absorbance maximum and electronic transition is/are

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(a) → (ii)

(b) → (i)

(a) → (iii)

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The major product in the given reaction sequence is Q. The mass spectrum of Q shows ([M] = molecular ion peak)

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[M], [M+2], [M+4], and [M+6] peaks with relative intensity of 1:1:1:1

[M], [M+2], [M+4], and [M+6] peaks with relative intensity of 1:3:3:1

[M], [M+2], and [M+4] peaks with relative intensity of 1:2:1

[M] and [M+2] peaks with relative intensity of 1:1

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In thermogravimetric analysis, 12.45 mg of CuSO₄·5H₂O was subjected to heating under N₂ atmosphere. At a particular temperature, there was a weight loss of 3.6 mg. The number of water molecule(s) lost per formula unit is ____.

(Given molar mass (in g mol⁻¹) of H = 1.0, O = 16.0, S = 32.0, and Cu = 63.5)

(rounded off to the nearest integer)

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The compound which gives a fragment at

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Diagram for Chemistry question 12 (figure 2)

Diagram for Chemistry question 12 (figure 3)

Diagram for Chemistry question 12 (figure 4)

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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)

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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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The major product in the given reaction is Q. The mass spectrum of Q shows { [M] = molecular ion peak}

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[M], [M+2] and [M+4] with relative intensity of 1:2:1

[M] and [M+2] with relative intensity of 1:1

[M], [M+2] and [M+4] with relative intensity of 1:3:1

[M] and [M+2] with relative intensity of 2:1

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In differential thermal analysis (DTA)

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the temperature differences between the sample and reference are measured as a function of temperature

the differences in heat flow into the reference and sample are measured as a function of temperature

the change in the mass of the sample is measured as a function of temperature

the glass transition is observed as a sharp peak

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An organic compound exhibits the [M]⁺, [M+2]⁺ and [M+4]⁺ peaks in the intensity ratio 1:2:1 in the mass spectrum, and shows a singlet at δ 7.49 in the ¹H NMR spectrum in CDCl₃. The compound is:

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1,4-dichlorobenzene

1,4-dibromobenzene

1,2-dibromobenzene

1,2-dichlorobenzene

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GATE CY topic:instrumental-methods-analysis PYQs

How to practice topic:instrumental-methods-analysis

Question 25

Question 24

Question 49

Question 16

Question 60

Question 12

Question 40

Question 13

Question 17

Question 7