Paramagnetism of oxygen is explained on the basis of its electronic configuration of

• ($\mathrm{\pi }$*2p_x)¹($\mathrm{\pi }$2p_y)¹

• ($\mathrm{\pi }$*2p_y)¹($\mathrm{\pi }$*2p_z)¹

• (σ*2s)¹($\mathrm{\pi }$2p_y)¹

• (σ*2s)¹($\mathrm{\pi }$2p_y)¹

Which of the following overlaps leads to bonding?

Which of the following statements is correct ?

• All carbon to carbon bonds contain a σ-bond and one or more $\mathrm{\pi }$-bonds

• All carbon to hydrogen bonds are $\mathrm{\pi }$-bonds

• All oxygen to hydrogen bonds are hydrogen bonds

• All carbon to hydrogen bonds are $\mathrm{\pi }$-bonds

An example of a polar covalent compound is :

• KCl

• NaCl

• CCl₄

• HCl

Acetylene molecule has carbon in:

• sp -hybridization

• sp² -hybridization

• sp³ -hybridization

• sp³d -hybridization

In which of the following compound sp² hybridisation is absent ?

• CH ≡ C - CH = CH₂

• CH ≡ C - CH₂ - CH₃

• CH₃ - CH = CH₂

• CH₂ = CH - CH₂ - CH₃

157.

How many electron pairs are present in valence shell of oxygen in water molecule ?

• 4

• 1

• 2

• 3

C - Cl bond is stronger than C - I bond because

• C - Cl bond is more ionic than C - I

• C - Cl bond is more ionic than C - I

• C -Cl bond is more covalent than C - I

• C - Cl bond length is longer than C - I

Bond energy of hydrogen gas is - 433 kJ. How much is the bond dissociation energy of 0.5 mole of hydrogen gas ?

• -433 kJ

• +433 kJ

• -216 kJ

• +216 kJ

Which one of the following has lowest bond dissociation energy ?

• Cl - Cl

• F - F

• Br - Br

• I - I