chemical bonding

Which of the following molecules is not an exception to octet rule?

• BF3

• PF5

• CO2

• IF7

For which of the follwoing hybridisation the bond angle is maximum?

• Sp2

• Sp

• Sp3

• dSp2

Which of the following molecule is not polar?

• NH3

• NF3

• BF3

• CHCl3

PCl5 molecule has the follwoing geometry

• Trigonal bipyramidal

• Octahedral

• Square Planar

• Pyramidal

In which of the following species is the underlined carbon having Sp3 hybridisation?

• CH3COOH

• CH3CH2OH

• CH3COCH3

• CH2=CHCH3

Which one of the following statements is not correct for sigma and pi bonds between two carbon atoms?

• Sigma bond is stronger than pi bond

• Bond energies of sigma and pi bonds are of the order of 264 kJ /mol

• Free rotation of atoms around a sigma bond is allowed but not in case of a pi bond

• Sigma bond is formed from hybridised orbital and pi bond is formed from unhybridised orbital.

Which among the following is diamagnetic?

• N2

• O2

• N2^2-

• O2^-

Which of the following statement is correct about CO3^2- ?

• The hybridisation of central atom is Sp3

• Its canonical structure has one C--O single bond and two C=O double bonds

• All C--O bond lengths bond lengths are equal

• Canonical structures are less stable

The types of hybrid orbitals of nitrogen in NO2⁺,NO3^- and NH4⁺ respectively are expected to be

• Sp, Sp3, Sp2

• Sp, Sp2, Sp3

• Sp3, Sp ,sp2

• Sp2,sp3,Sp

The correct decreasing order of the boiling points of H2O and NH3 is:

• H2O > NH3

• NH3 > H2O