In which molecule are all atoms coplanar? from Chemistry Chemica

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 Multiple Choice QuestionsMultiple Choice Questions

211.

In which of the following molecules, maximum number of lone pairs is present on the central atom?

  • NH3

  • H2O

  • ClF3

  • XeF2


212.

Match the following:
List - I (Magnetic Property) List - II (Substance)
A. Ferromagnetic 1. O2
B. Antiferromagentic 2. CrO2
C. Ferrimagnetic 3. MnO
D. Paramagnetic

4. Fe3O4

5. C6H6

  • A - 3; B - 2; C - 4; D - 1

  • A - 2; B - 3; C - 4; D - 1

  • A - 1; B - 3; C - 5; D - 4

  • A - 4; B - 2; C - 3; D - 5


213.

Which one of the following statements is not correct?

  • O3 is used as a germicide.

  • In O3 , O - O bond length is identical with that of molecular oxygen.

  • O3 is an oxidising agent

  • The shape of O3 molecule is angular.


214.

Which among the following are having diamagnetic property?

(i) B2    (ii) N2    (iii)O2   (iv) C2

  • II, III

  • I ,IV

  • II, IV

  • I, II


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215.

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

  • Electron nuclear attraction

  • Electron sharing

  • Electron transfer

  • Electrostatic attraction


216.

Hybridisation involves

  • addition of an electron pair

  • mixing up of atomic orbitals

  • removal of an electron pair

  • separation of orbitals


217.

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

  • H2

  • He2+

  • He2

  • Li2


218.

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

  • H2O

  • HF

  • NH3

  • C6H6


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219.

The Lewis structure for O3 molecule is given below. The correct formal charges on oxygen atoms labelled 1, 2, 3 are respectively.

                                

  • -1, 0, +1

  • +1, 0, -1

  • +1, -1, 0

  • 0, +1, -1


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220.

In which molecule are all atoms coplanar?

  • CH4

  • BF3

  • PF3

  • NH3


B.

BF3

Valence shell electronic configuration of B in excited state is 2s1, 2px1, 2py1, 2pz0. On hybridisation, these atomic orbitals form three trigonal planar sp2 hybrid orbitals which being singly occupied, overlap with three singly filled 2pz atomic orbitals of three F-atom to form three B-F σ bonds which are coplanar and inclined to each other at 120°.


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