GATE CY year:2021 PYQs & Answers — Page 4

Questions 31–40 of 65. Imported answers require independent review unless marked reviewed.

Topic practice 65 questionsPage 4 of 7

The Mo–Mo bond order in [η⁵-C₅H₅)Mo(CO)₂]₂ which obeys the 18-electron rule is ______.

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The change in enthalpy (ΔH) for the reaction

2 P (s) + 3 Br₂ (l) → 2 PBr₃ (l)

is −243 kJ. In this reaction, if the amount of phosphorus consumed is 3.1 g, the change in enthalpy (rounded off to two decimal places) is ______ kJ.

[Atomic Wt. of P = 31]

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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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A 5 V battery delivers a steady current of 1.5 A for a period of 2 h. The total charge that has passed through the circuit is ______ Coulombs.

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The spin-only magnetic moment of [Co(H₂O)₆]²⁺ (rounded off to one decimal place) is ______ BM.

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The geometry and the number of unpaired electrons in tetrakis(1-norbornyl)Co

respectively, are:

Your answerChoose one option.

tetrahedral and one

tetrahedral and five

square planar and one

square planar and three

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The yellow color of an aqueous solution of K₂CrO₄ changes to red-orange upon the addition of a few drops of HCl. The red-orange complex, the oxidation state of its central element(s), and the origin of its color, respectively, are:

Your answerChoose one option.

chromium chloride, +3, d-d transition

dichromate ion, +6 and +6, charge transfer

perchlorate ion, +7, charge transfer

chromic acid, +6, charge transfer

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The shapes of the compounds ClF₃, XeOF₂, N₃⁻ and XeO₃F₂ respectively, are:

Your answerChoose one option.

T-shape, T-shape, linear and trigonal bipyramidal

trigonal planar, T-shape, V-shape and square pyramidal

T-shape, trigonal planar, linear and square pyramidal

trigonal planar, trigonal planar, V-shape and trigonal bipyramidal

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The metal borides that contain isolated boron atoms are:

Your answerChoose one option.

Tc₇B₃ and Re₇B₃

Cr₅B₃ and V₃B₂

Ti₄B₄ and V₃B₄

TiB and HfB

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The major product formed in the following reaction

is:

Your answerChoose one option.

non-6-yn-2-one

non-3-yn-8-one

non-2-yn-6-one

non-3-en-8-one

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GATE CY year:2021 PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30