Chemistry
GATE CY topic:main-group-elements PYQs
Build your understanding with focused practice from past exam papers.
Questions 11–20 of 32. Imported answers require independent review unless marked reviewed.
Question 58
Open questionCYNAT2 marksNeeds review
The enthalpy change for the exothermic reaction between BeI₂ and HgF₂ is ______ kJ mol⁻¹ (rounded off to the nearest integer)
(Given: Bond dissociation energy (in kJ mol⁻¹) for Be–F = 632, Be–I = 289, Hg–F = 268 and Hg–I = 145)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 28
Open questionCYMSQ1 markNeeds review
The CORRECT statement(s) about thallium halides is(are)
Your answerSelect all correct options. You can choose more than one.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 53
Open questionCYMSQ2 marksNeeds review
The CORRECT statement(s) regarding B₁₀H₁₄ is(are)
Your answerSelect all correct options. You can choose more than one.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 54
Open questionCYMSQ2 marksNeeds review
The CORRECT statement(s) about the Group-I metals is(are)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 8
Open questionCYMCQ1 markNeeds review
Reaction of LiAlH₄ with one equivalent of Me₃N·HCl gives a tetrahedral compound, which reacts with another equivalent of Me₃N·HCl to give compound N. The compound N and its geometry, respectively, are:
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 28
Open questionCYMCQ2 marksNeeds review
The shapes of the compounds ClF₃, XeOF₂, N₃⁻ and XeO₃F₂ respectively, are:
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 41
Open questionCYMCQ2 marksNeeds review
The correct order of Lewis acid strengths of BF₂Cl, BFClBr, BF₂Br and BBr₂ is:
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 55
Open questionCYNAT2 marksNeeds review
The quantity of the cobalt ore [Co₃(AsO₄)₂·H₂O] required to obtain 1 kg of cobalt (rounded off to two decimal places) is __________ kg.
[Atomic Wt. of Co = 59, As = 75, O = 16, H = 1]
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 9
Open questionCYMCQ1 markNeeds review
The CORRECT statement about hexagonal boron nitride is:
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 11
Open questionCYMCQ1 markNeeds review
Among the following species, the one that has pentagonal shape is:
(Given: atomic numbers of O, F, S, I and Xe are 8, 9, 16, 53 and 54, respectively)
Your answerChoose one option.
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