Mid Semester Exams

The s-orbital does not show preference to any direction because

• It is the smallest orbital

• It is present in every atom

• It is spherically symmetric

• It is the first orbital

According to Valence Bond Theory, the formation of a stable bond requires

• The electrons should have opposite spins

• The two atoms should be close to each other

• The greater overlapping of the electron clouds

• All of the mentioned

The p-orbital is in the shape of a

• Sphere

• Dumbbell

• Pear-shaped lobe

• None of the mentioned

The strength of covalent bonds ___________ to extent of overlapping of orbitals.

• may be or may not be related to

• is independent of

• is dependent on

• is not related to

Which type of bond is present between hydrogens in hydrogen molecule?

• Sigma bond

• Pi bond

• Ionic bond

• Metallic bond

The pi-bond involves

• axial overlapping

• side-wise overlapping

• end to end type of overlapping

• head-on overlapping

A pi bond is stronger than a sigma bond

• True

• False

Valence bond theory explains the overlapping of atomic orbitals.

• True

• False

Bond Order of O₂, F₂, N₂ respectively are

• +1, +2, +3

• +2, +3, +1

• +2, +1, +3

• +3, +2, +1

Arrange the following molecules in decreasing bond length

• O₂ > O₂^– > O₂⁺ > O₂^2-

• O₂^2- > O₂^– > O₂ > O₂⁺

• O₂^2- > O₂^– > O₂⁺ > O₂

• O₂^– > O₂⁺ > O₂^2- > O₂