From the following bond energies:

H-H bond energy: 431.37 kJ mol^-

C=C  bond energy: 606.10 kJ mol-

C- C bond energy: 336.49 kJ mol-

C-H bond energy: 410.50 kJ mol-

Enthalpy for the reaction,


will be

• 1523.6 kJ  mol^-

• -243.6 kJ mol^-

• -1200. kJ mol^-

• -1200. kJ mol^-

According to MO theory which of the following lists ranks the nitrogen species in terms of increasing bond order?

33.

The state of hybridization of C₂, C₃, C₅ and C₆ of the hydrocarbon,


is in the following sequence

• sp, sp³, sp² and sp³

• sp³, sp², sp² and sp

• sp,sp²,sp² and sp³

• sp,sp²,sp² and sp³

In which of the following molecules/ions BF_3, NO₂^-, NH₂^- and H₂O, the central atom is sp² hybridised?

• NO₂^- and NH₂^-

• NH₂^- and H₂O

• NO₂^- and H₂O

• NO₂^- and H₂O

The angular shape of ozone molecule (O₃) consists of 

• 1 sigma and 2 pi bonds

• 2 sigma and 2 pi bonds

• 1 sigma and 1 pi bonds

• 1 sigma and 1 pi bonds

The correct order of increasing bond angles in the following triatomic species is 

Four diatomic solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

Bond dissociation enthalpy of H₂, Cl₂ and HCl and 434, 242 and 431 kJ mol^-1 respectively.  Enthalpy of formation of HCl is 

• 93 kJ mol^-1

• -245 kJ mol^-1

• -39 kJ mol^-1

• -39 kJ mol^-1

In the hydrocarbon



The state of hybridization of carbon 1, 3, and 5 are in the following sequence

• sp², sp, sp³

• sp, sp³, sp²

• sp, sp², sp³

• sp, sp², sp³

The correct order of C-O bond length among CO, CO₃^2-, CO₂ is,

• CO₂<  CO₃^2-<  CO

• CO <  CO₃^2-<  CO₂

• CO₃^2- <CO₂ <CO

• CO₃^2- <CO₂ <CO