NEET Chemical Bonding and Molecular Structure — Set 14

Question 1

Which molecule has an expanded octet with 10 electrons around the central atom?

Accepted Answer

In $ \ce{PCl5} $, phosphorus has 5 bonds (10 electrons), exceeding the octet due to d-orbital availability.

Question 2

Which molecule has the highest bond enthalpy among the halogens?

Accepted Answer

$ \ce{Cl2} $ has a bond enthalpy of ~243 kJ/mol, higher than $ \ce{F2} $ (159 kJ/mol), $ \ce{Br2} $ (193 kJ/mol), or $ \ce{I2} $ (151 kJ/mol) due to optimal bond strength.

Question 3

The number of lone pairs on xenon in $ \ce{XeF2} $ is:

Accepted Answer

In $ \ce{XeF2} $, xenon has 8 valence electrons, forms 2 bonds (4 electrons used), leaving 6 electrons as 3 lone pairs in a $ sp^3d $ hybridized state.

NEET Chemistry: Chemical Bonding and Molecular Structure — Practice Set 14

Q1. Which molecule has an expanded octet with 10 electrons around the central atom?

Q2. Which molecule has the highest bond enthalpy among the halogens?

Q3. The number of lone pairs on xenon in \( \ce{XeF2} \) is:

Q4. The shape of \( \ce{SF4} \) molecule is:

Q5. Which molecule has the shortest bond length?

Q6. Which molecule has the highest bond enthalpy?

Q7. Which molecule has the highest bond enthalpy among those with a single bond?

Q8. The hybridization of oxygen in \( \ce{OF2} \) is:

Q9. What is the bond order of \( \ce{N2} \) molecule?

Q10. The bond order of \( \ce{F2^-} \) ion, based on molecular orbital theory, is: