C125 SIMPLE EXAM QUESTIONS WITH CORRECT ANWERS

If we apply the HOMO and LUMO concepts in atomic orbitals, we will have HOAO (Highest Occupied Atomic Orbitals) and LUAO (Lowest Unoccupied Atomic Orbitals). What is the LUAO of Na atom? - Answer- 3p Which one is correct about the bond lengths in PCl5? Equatorial bonds are longer because they experience smaller repulsion The axial bonds are shorter because they are far away from other bonds All P-Cl bonds have the same bond length. Axial bonds are longer because they experience higher repulsion - Answer- Axial bonds are longer because they experience higher repulsion Predict the molecular shape of SF2 - Answer- bent Draw the best Lewis structure of N2O and consider resonance structures if there are any. What is the bond order between the two N atoms in N2O? - Answer- More than 2 but less than 3 Which one is correct about the reaction between cyanide ion and hydrogen ion? There are two correct answers for this problem. The hydrogen ion will be added to C because by doing so we will have a more stable product. The chance for adding hydrogen ion to C is the same as adding it to N because both of them have lone pairs to accept H. The hydrogen ion will be added to C because C bears more negative charges. The hydrogen ion will be added to N because N is more electronegative - Answer- The hydrogen ion will be added to C because by doing so we will have a more stable product.