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

In which of the following pairs, the two species are isostructural?

• SF₄ and XeF₄

• SO₃^2- and NO₃^-

• BF₃ and NF₃

• BF₃ and NF₃

In which of the following molecules are all the bonds not equal? 

• ClF₃

• BF₃

• AlF₃

• AlF₃

Which of the following is not isostructural with SiCl₄?

• SCl₄

• 
  SO₄^2-

• PO₄^3- 

• PO₄^3-