821.

Hydrofluoric acid shows hydrogen bonding due to :

• high electron affinity of fluorine

• high bond dissociation energy of fluorine

• high electronegativity of fluorine

• none of the above

Assertion: The S-S-S bond angle in S₈ molecule is 105°.

Reason : S₈ has a V-shape.

• 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 : Sodium formate has both the C-O bonds have same value 1.27Å.

Reason : Equal bond length is due to the phenomenon of resonance.

• 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

Ionic compounds are formed most easily with :

• low electron affinity , high ionisation energy

• high electron affinity , low ionisation energy

• low electron affinity , low ionisation energy

• high electron affinity , high ionisation energy

The order of bond length is

• O₂ < O₃ < O${}_2^{2-}$

• O₂ < O${}_2^{2-}$ < O₃

• O${}_2^{2-}$ < O₃ < O₂

• O₂ = O${}_2^{2-}$ > O₃

The correct order of dipole moment is

• CH₄ <NF₃ <NH₃ <H₂O

• NF₃ <CH₄ <NH₃ <H₂O

• NH₃ <NF₃ <CH₄ <H₂O

• H₂O <NH₃ <NF₃ <CH₄

Which of the following is paramagnetic ?

• N₂

• C₂

• N₂⁺

• O₂^2-

Assertion : SeCl₄ does not have a tetrahedral structure.

Reason : Se in SeCl₄ has two lone pairs.

• 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.

Intermolecular hydrogen bonding is strongest in :

• C₂H₅OH

• HF

• H₂O

• CH₃COCH₃

Hybridization present in ClF₃ is :

• sp²

• sp³

• dsp²

• sp³d