Assertion : The free gaseous Cr atom has six unpaired electrons.R

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 Multiple Choice QuestionsMultiple Choice Questions

591.

Which of the following are arranged in the decreasing order of dipole moment?

  • CH3Cl, CH3Br, CH3F

  • CH3Br, CH3Cl, CH3F

  • CH3Cl, CH3Br, CH3F

  • CH3Br, CH3F, CH3Cl


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592.

Assertion : The free gaseous Cr atom has six unpaired electrons.

Reason: Half-filled s orbital has greater stability.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


C.

If assertion is true but reason is false

Cr24 [Ar] 3d4 4s2Cr [Ar] 3d54s1

Half-filled d-orbital has greater stability.


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593.

Assertion : All F- S -F angle in SF4 is greater than 90° but less than 180°.

Reason : The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


594.

Which of the following compounds possesses the C-H bond with the lowest bond dissociation energy?

  • Toluene

  • Benzene

  • n-Pentane

  • 2,2-Dimethylpropane


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595.

Assertion : NF3 is a weaker ligand than N(CH3).

Reason : NF3 ionizes to give F- ions in aqueous solution.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

  • If both assertion and reason are true and the reason is not the correct explanation of the assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


596.

Hybridisation in CH3, C+H3  and C-H3 are respectively

  • sp2, sp2, sp3

  • sp2, sp3, sp3

  • sp3, sp3, sp2

  • sp3, sp2, sp3


597.

Assertion : The O - O bond length in H2O2 is shorter than that of O2F2.

Reason : H2O2 is an ionic compound.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

  • If both assertion and reason are true and the reason is not the correct explanation of the assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


598.

In which of the following - bonding is possible?

  • CO32-

  • PO43-

  • NO3-

  • NO2-


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599.

Smallest intermolecular distance is found in

  • O2

  • O2+

  • O2-

  • O22-


600.

The number of lone pairs of electrons on the central atoms of H2O, SnCl2, PCl3 an XeF2 respectively are

  • 2, 1, 1, 3

  • 2, 2, 1, 3

  • 3, 1, 1, 2

  • 2, 1, 2, 3


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