Which of the following is paramagnetic?

• CO

• N₂

• O₂

• H₂O₂

Which of the following has sp³ -hybridisation?

• BCl₃

• PCl₃

• BeCl₃

• None of these

Among the following compounds which is planar in shape is

• acetylene

• benzene

• isobutene

• methane

The number of σ bonds in P₄O₁₀ is:

• 6

• 16

• 7

• 17

Which of the following ions is paramagnetic?

• Cu⁺⁺

• Zn⁺⁺

• Ni⁺⁺

• Both 'a' and 'c'

The molecule having largest dipole moment among the following is

• CHI₃

• CH₄

• CHCl₃

• CCl₄

Pick out the incorrect statement from the following :

• sp hybrid orbitals are equivalent and are at an angle of 180° with each other

• sp² hybrid orbitals are equivalent and bond angle between any two of them is 120°

• sp³d² hybrid orbitals are equivalent and are oriented towards corners of a regular octahedron

• dsp² hybrid orbitals are equivalent with a bond angle of 90° between the two atoms

Which of the following electronic configurations has maximum energy?

The hybridisation of the central atom in BrF₅ molecule is :

• sp³

• dsp²

• sp³d²

• d³sp³

490.

A covalent molecule AB₃ has pyramidal structure. The number of lone pair and bond pair of electrons in the molecule a respectively :

• 2 and 2

• 0 and 2

• 3 and 1

• 1 and 3