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?

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

36.

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