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.

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.

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

• Toluene

• Benzene

• n-Pentane

• 2,2-Dimethylpropane

Assertion : NF₃ is a weaker ligand than N(CH₃)₃ .

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.

Hybridisation in ${\mathrm{CH}}_3,\stackrel{+}{ \mathrm{C}}{\mathrm{H}}_3 \mathrm{and} \stackrel{-}{\mathrm{C}}{\mathrm{H}}_3$ are respectively

• sp², sp², sp³

• sp², sp³, sp³

• sp³, sp³, sp²

• sp³, sp², sp³

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.

In which of the following $\mathrm{p\pi }-\mathrm{d\pi }$ bonding is possible?

• ${\mathrm{CO}}_3^{2-}$

• ${\mathrm{PO}}_4^{3-}$

• ${\mathrm{NO}}_3^{-}$

• ${\mathrm{NO}}_2^{-}$

Smallest intermolecular distance is found in

• O₂

• O₂⁺

• O₂^-

• O₂^2-

219.

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

dsp² hybridisation is found in

• [Ni(CN)₄]^2-

• [CoCl₄]^2-

• [CuCl₄]^3-

• [CuCl₄]^2-