Duduli

Answer:- When all the four orbitals of L-shell (2S,2Px,2Py,2Pz) get mixed up, four SP3 hybrid orbitals result.They are exactly similar in shape and are directed to the four corners of regular tetrahedron.The bond angle in it is 109⁰28'.Each SP3 orbital has 25% S-character and 75% P-character.

Answer:- When two orbitals of L-shell (2S,2Px or 2Py or 2Pz) get mixed up, two hybrid orbitals result.These two SP orbitals are exactly similar in shape and make an angle of 180⁰.Each SP orbital has 50%  S-character and 50% P-character.

Answer:- When three orbitals of L-shell(2S,2Px,2Py) get mixed up, three hybrid orbitals result.These are exactly similar in shape and are directed to the three corners of a regular tetrahedron. The bond angle in it is 120⁰.Each SP2-orbital has 33% S-character and 67% P-character.

Answer:- Dipole moment measures the degree of polarity of a molecule.In case of diatomic molecules, more the difference in electronegatives of two bonded atoms, more is the polarity and hence more is the value of dipole moment.