GATE CY topic:chemical-sciences PYQs & Answers — Page 56 — Exam Papers

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Questions 551–560 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 56 of 65

Two moles of an ideal gas X and two moles of an ideal gas Y, initially at the same temperature and pressure, are mixed under isothermal-isobaric condition. The entropy change on mixing is __________ J K⁻¹. (Up to one decimal place. Use R = 8.31 J K⁻¹ mol⁻¹)

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The energy of a hydrogen molecule in its ground state equilibrium configuration is −31.7 eV. Its dissociation energy is _________ eV. (Up to one decimal place)

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The total number of valence electrons in W(η³-Cp)(η⁵-Cp)(CO)₂ is _____. (Atomic number of W = 74)

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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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In the electron ionization (EI) mass spectra, methyl hexanoate, methyl heptanoate and methyl octanoate give the same base peak. The m/z value of the base peak is _____.

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In the following reaction,

Diagram for Chemistry question 26

Your answerChoose one option.

A.

X is the major product and Y is the minor product

B.

X is the only product

C.

Y is the only product

D.

X is the minor product and Y is the major product

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The enantiomeric pair, among the following, is

Your answerChoose one option.

A.

Diagram for Chemistry question 27

B.

Diagram for Chemistry question 27 (figure 2)

C.

Diagram for Chemistry question 27 (figure 3)

D.

Diagram for Chemistry question 27 (figure 4)

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The major product formed in the following reaction sequence is

Diagram for Chemistry question 28

Your answerChoose one option.

A.

Diagram for Chemistry question 28 (figure 2)

B.

Diagram for Chemistry question 28 (figure 3)

C.

Diagram for Chemistry question 28 (figure 4)

D.

Diagram for Chemistry question 28 (figure 5)

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The major product in the following reaction sequence is

Diagram for Chemistry question 29

Your answerChoose one option.

A.

Diagram for Chemistry question 29 (figure 2)

B.

Diagram for Chemistry question 29 (figure 3)

C.

Diagram for Chemistry question 29 (figure 4)

D.

Diagram for Chemistry question 29 (figure 5)

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The major product formed in the following reaction sequence is

Diagram for Chemistry question 30

Your answerChoose one option.

A.

Diagram for Chemistry question 30 (figure 2)

B.

Diagram for Chemistry question 30 (figure 3)

C.

Diagram for Chemistry question 30 (figure 4)

D.

Diagram for Chemistry question 30 (figure 5)

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