Module II: Atomic Structure and Chemical Bonding - HW-04-02

Chapter Name - CHEMICAL BONDING - 4
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Q1. Define electrovalent bond.

Q2. Show the formation of a nitrogen molecule from two nitrogen atoms in terms of Lewis theory.

Q3. What do you understand by a polar covalent bond? Give two examples.

Q4. What is a coordinate covalent bond ? How is it different from a covalent bond?

Q5. What are the basic postulates of VSEPR theory?

Q6. Predict the shape of methane ( CH4 ) on the basis of VSEPR theory.

Q7. It is a molecule the difference between the electro-negativity of two atom is 1.7. How much % will be ionic and covalent character?

Q8. What do you understand by the term, ‘hybridisation’?

Q9. How would you explain the shape of ammonia molecule on the basis of hybridisation?

Q10. Draw the canonical structures of CO23 and SO2.

Q11. What is the basic difference between the valence bond and molecular orbital theories?

Q12. Calculate the bond orders for Li2 and Be2 molecules using the molecular orbital diagrams.

Q13. Predict the magnetic behaviour of O2

Q14. What do you understand by a chemical bond?

Q15. Explain the process of bond formation as a decrease in energy.

Q16. What do you understand by the term, ‘bond length’ ?

Q17. Describe the two possible ways in which the noble gas electronic configuration is achieved in the process of bond formation.

Q18. What are Lewis electron dot symbols ? Show the formation of MgCl2 in terms of Lewis symbols.

Q19. Define a coordinate bond and give some examples.

Q20. What is VSEPR theory ? predict the shape of SF6 molecule using this theory.

Q21. Why do we need the concept of hybridisation ? How does it help in explaining the shape of methane ?

Q22. Give the salient features of molecular orbital theory.

Q23. Be2 molecule does not exist. Explain on the basis of molecular orbital theory.

Q24. Write down the molecular orbital electronic configuration of the following species and compute their bond orders. O2 ; O2+; O2− ; O22−

Q25. BF3 is a polar molecule but it does not show dipole moment. Why?

Q26. Atom A and B combine to form AB molecule. If the difference in the electronegativity between A and B is 1.7. What type of bond do you expect in AB molecule?

Q27. Write down the resonating structures of N2O, SO42–, CO32– and BF3.