A covalent bond between two atoms is formed by which of the following?

• Electron nuclear attraction

• Electron sharing

• Electron transfer

• Electrostatic attraction

Hybridisation involves

• addition of an electron pair

• mixing up of atomic orbitals

• removal of an electron pair

• separation of orbitals

483.

On the basis of Molecular Orbital Theory (MOT) which molecule does not exist?

• H₂

• He${}_2^{+}$

• He₂

• Li₂

Which of the following compounds in liquid state does not have hydrogen bonding?

• H₂O

• HF

• NH₃

• C₆H₆

The Lewis structure for O₃ molecule is given below. The correct formal charges on oxygen atoms labelled 1, 2, 3 are respectively.

• -1, 0, +1

• +1, 0, -1

• +1, -1, 0

• 0, +1, -1

In which molecule are all atoms coplanar?

• CH₄

• BF₃

• PF₃

• NH₃

Inoic bonds are usually formed by combination of elements with

• high ionisation potential and low electron affinity

• low ionisation potential and high electron affinity

• high ionisation potential and high electron affinity

• low ionisation potential and low electron affinity

The angle between two covalent bonds is maximum in

• CH₄

• H₂O

• CO₂

• SO₂

If a molecule MX₃ has zero dipole moment, the sigma bonding orbital used by M (At. no. 13) are

• pure p

• sp- hybridised

• sp²- hybridised

• sp³- hybridised

CO₂ in isostructural with

• SnCl₂

• SO₂

• HgCl₂

• All of these