Chemical Bonding

Chemical Bonding
Class:XI / Unit:4

Molecules are held together in a crystal by

hydrogen bond
Van der Waal’s attraction
electrostatic attraction
dipole-dipole attraction

MX₆ is a molecule with octahedral geometry. How many X – M – X bonds are at 180°

Four
Two
Six
Three

Which of the molecules does not have a permanent dipole moment

CS₂
SO₃
SO₂
H₂S

Which one has a pyramidal shape

SO₃
NO_3^–
CO₃^2-
PCl₃

C-O bond length is minimum in

CO₂
CO₃^2-
CO
HCOO^–

When O₂ is converted into O₂⁺

paramagnetic character increases
bond order decreases
paramagnetic character decreases and the bond order increases
both paramagnetic character and bond order increase

Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule B₂ is

0 and paramagnetic
1 and diamagnetic
0 and diamagnetic
1 and paramagnetic

The number of nodal planes present in sigma* s antibonding orbitals is

0
1
2
3

Which metal has a greater tendency to form metal oxide

Ca
Fe
Cr
Al

In Calcium carbide molecule, between the carbon atoms there are

one sigma and two pi bonds
two sigma and one pi bonds
three pi bonds
three sigma bonds

P-O bond order in PO₄^-3 is

2.33
1.25
1.75
1.33