On the basis of Molecular Orbital Theory (MOT) which molecule doe

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following can be represented by the configuration [Kr] 5s2?

  • Ca

  • Sr

  • Ba

  • Ra


2.

2p orbitals have

  • n = 1; l = 2

  • n = 1; l = 0

  • n = 2; l = 1

  • n = 2; l = 0


3.

Aufbau principle is not satisfied by

  • Cr and Cl

  • Cu and Ag

  • Cr and Mg

  • Cu and Na


4.

Neutrons are found in atoms of all elements except in

  • chlorine

  • oxygen

  • argon

  • hydrogen


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5.

The atomic weight of an element is 39. The number of neutrons in its nucleus is one more than the number of protons. The number of protons, neutrons and electrons-respectively in its atoms would be

  • 19, 20, 19

  • 19, 19, 20

  • 20, 19, 19

  • 20, 19, 20


6.

Out of the following electronic configurations the one of a transition element, is

  • 1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p6

  • 1s2, 2s2p6, 3s2 3p6 3d3, 4s2

  • 1s2, 2s2 2p6, 3s2 3p6, 4s2

  • 1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p1


7.

A covalent bond between two atoms is formed by which of the following?

  • Electron nuclear attraction

  • Electron sharing

  • Electron transfer

  • Electrostatic attraction


8.

Hybridisation involves

  • addition of an electron pair

  • mixing up of atomic orbitals

  • removal of an electron pair

  • separation of orbitals


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9.

On the basis of Molecular Orbital Theory (MOT) which molecule does not exist?

  • H2

  • He2+

  • He2

  • Li2


C.

He2

As bond order of He2 molecule is zero, so there is no existence of this molecule.

He2 (4) = σ 1s2, σ* 1s2

Bond order = No. of bonding electrons - No. of anti-bonding electrons2

                 = 2 - 22

                 = 0


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10.

Which of the following compounds in liquid state does not have hydrogen bonding?

  • H2O

  • HF

  • NH3

  • C6H6


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