GATE CY topic:main-group-elements PYQs & Answers — Page 3

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topic:main-group-elements

Questions 21–30 of 32. Imported answers require independent review unless marked reviewed.

Topic practice 32 questionsPage 3 of 4

Among the following,

the total number of species having nido structure is ______

(Given: atomic numbers of H, B, C, O, Ni, Rh and Os are 1, 5, 6, 8, 28, 45 and 76, respectively)

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The INCORRECT statement about the interhalogen compound ICl₃ is:

Your answerChoose one option.

It exists as a dimer.

Geometry around the iodine is tetrahedral in solid-state.

It decomposes as ICl and Cl₂ in gas-phase.

Liquid ICl₃ conducts electricity.

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Among the following carbon allotropes, the one with discrete molecular structure is

Your answerChoose one option.

Diamond

α-Graphite

β-Graphite

Fullerene

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The INCORRECT statement about the silicones is:

Your answerChoose one option.

They are thermally unstable because of the Si–C bond.

They are insoluble in water.

They are organosilicon polymers.

They have stable silica-like skeleton (–Si–O–Si–O–Si–).

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Gas phase bond length and dipole moment of a compound (MX) is 3 Å and 10.8 D, respectively. The ionic character in gas phase MX is __________%. (Round off to one decimal place) (1D = 3.336 × 10⁻³⁰ C m)

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Following are the examples of silicate minerals Zircon, ZrSiO₄ Beryl, Be₃Al₂Si₆O₁₈ Pyrophyllite, Al₂(OH)₂[Si₄O₁₀] I II III The correct structural description of the minerals is

Your answerChoose one option.

I – Ortho silicate, II – Cyclic silicate and III – Sheet silicate

I – Ortho silicate, II – Sheet silicate and III – Cyclic silicate

I – Cyclic silicate, II – Sheet silicate and III – Ortho silicate

I – Sheet silicate, II – Ortho silicate and III – Cyclic silicate

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Based on Wade’s rule, the structure-type of

Your answerChoose one option.

closo

nido

arachno

hypho

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For the following reaction sequence,

X and Y, respectively, are

Your answerChoose one option.

and

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The reaction of PCl₃ with PhLi in 1:3 molar ratio yields X as one of the products, which on further treatment with CH₃I gives Y. The reaction of Y with n-BuLi gives product Z. The products X, Y and Z, respectively, are

Your answerChoose one option.

[PPh₄]Cl, [Ph₂P=CH₂] and Ph₂P(n-Bu)

PPh₃,

Ph₃PI

and Ph₂P(n-Bu)

PPh₃, [Ph₃P(CH₃)]I and Ph₃P=CH₂

[PPh₄]Cl, [Ph₃P=CH₂] and [Ph₃P(n-Bu)]Li

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The Latimer diagram of oxygen is given below. The value of x is ______ V. (Up to two decimal places)

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GATE CY topic:main-group-elements PYQs

Question 48

Question 2

Question 3

Question 4

Question 25

Question 28

Question 12

Question 39

Question 41

Question 45