Which one ofthe following compounds has sp² hybridisation ?

• CO₂

• SO₂

• N₂O

• CO

Number of lone pair (s) in XeOF₄ is/are

• 0

• 2

• 1

• 3

BCl₃ is a planar molecule, while NCl₃ is pyramidal, because

• N-Cl bond is more covalent than B-Cl bond

• nitrogen atom is smaller than boron atom

• B-Cl bond is more polar than NCl bond

• BCl₃ has no lone pair of electrons but NCl₃ has a lone pair of electrons.

The correct sequence of hybridisation of methane, ethene and acetylene is :

• sp, sp², sp³

• sp², sp³, sp

• sp³, sp², sp

• sp³, sp, sp²

The bond order of O${}_2^{+}$ is the same as in:

• N${}_2^{+}$

• CN^-

• CO

• NO⁺

Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?

• N₂

• C₂

• Be₂

• O₂

The manganate and permanganate ions are tetrahedral, due to :

• There is no π-bonding

• The π- bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese.

• The π-bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese

• The π-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese

Assertion : Bond lengths of P-Cl bonds in gaseous PCl₅ and solid PCl₅ are not equal.

Reason : Because in solid state two PCl₅ molecules are associated.

• 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.

639.

How many bonds are there in

• 18σ, 8$\mathrm{\pi }$

• 19σ, 4$\mathrm{\pi }$

• 14σ, 2$\mathrm{\pi }$

• 14σ, 8$\mathrm{\pi }$