GATE CY topic:chemical-sciences PYQs & Answers — Page 37

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Questions 361–370 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 37 of 65

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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The major product formed in the following reaction

is:

Your answerChoose one option.

Diagram for Chemistry question 31 (figure 2)

Diagram for Chemistry question 31 (figure 3)

Diagram for Chemistry question 31 (figure 4)

Diagram for Chemistry question 31 (figure 5)

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The major product formed in the following reaction [starting material: 1,2-diphenylbenzocyclobutene; methyl acrylate, CO₂Me, heat] is:

Your answerChoose one option.

Diagram for Chemistry question 32 (figure 2)

Diagram for Chemistry question 32 (figure 3)

Diagram for Chemistry question 32 (figure 4)

Diagram for Chemistry question 32 (figure 5)

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In the following reaction sequence [indanyl methyl ether treated with (i) sec-BuLi, THF; (ii) ZnCl₂ to give P; then 2-bromopyridine, Pd(PPh₃)₄, THF to give Q], the major products P and Q, respectively, are:

Your answerChoose one option.

Diagram for Chemistry question 33 (figure 2)

Diagram for Chemistry question 33 (figure 3)

Diagram for Chemistry question 33 (figure 4)

Diagram for Chemistry question 33 (figure 5)

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In an electrochemical cell, Ag⁺ ions in AgNO₃ are reduced to Ag metal at the cathode and Cu is oxidized to Cu²⁺ at the anode. A current of 0.7 A is passed through the cell for 10 min. The mass (in grams) of silver deposited and copper dissolved, respectively, are: [Faraday Constant = 96,485 C mol⁻¹, Atomic Weight of Ag = 107.9, Atomic Weight of Cu = 63.55]

Your answerChoose one option.

0.469 and 0.138

0.235 and 0.138

0.469 and 0.069

0.235 and 0.069

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Among the following

the compounds which can be prepared by nucleophilic substitution reaction are:

Your answerChoose one option.

III, IV, and V

I, II, and VI

II, IV, and VI

I, III, and V

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GATE CY topic:chemical-sciences PYQs

Question 26

Question 27

Question 28

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35