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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


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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.


B.

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

Ozone is a polar molecule with a dipole moment of 0.53 D. The bonding can be expressed as a resonance hybrid with a single bond on one side and a double bond on the other. 

Hence, in O3, O-O bond length is not identical with that of molecular oxygen.

Ozone is a powerful oxidising agent, far stronger than O2.


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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


220.

In which molecule are all atoms coplanar?

  • CH4

  • BF3

  • PF3

  • NH3


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