March 6, 2014

Junior Inter Chemistry - Imp Questions from 1-3 Chapters

Following are important questions from Junior Intermediate Chemistry of AP Board. These are long answer type and short answer type questions.

1. ATOMIC STRUCTURE (8 Marks) - Long Answer type Questions

1. What are the postulates of Bohr's model of hydrogen atom? Give any two limitations of this model. Discuss the importance of this model to explain various series of line spectra in Hydrogen atom.
2. What are Quantum numbers? Explain the significance of quantum numbers.


Long Answer type Questions

1. What are first and second Ionisation Enthalpy? Why I.E.2 > I.E.1 Explain four factors influencing Ionisation Enthalpy?
2. What is a periodic property? How the following properties vary in a group and in a period?
a) Atomic radius b) I.E. c) E.N. d) Nature of Oxides e) Electron gain enthalpy
3. Write an essay on s, p, d and f block elements.


Long Answer type Questions

1. What do you understand by hybridization? Explain the different types of
hybridizations involving 's' and 'p' orbitals.

Short Answer type Questions

1. Give an account of VSEPR theory.
2. Explain sp3d hybridization with one example.
3. Explain sp3d2 hybridization with one example.
4. Explain the formation of coordinate covalent bond with two examples.
5. What is "Hydrogen bond"? Explain the different types of Hydrogen bonds with suitable examples.
6. Explain molecular orbital theory of oxygen molecule (& N2 molecule). Calculate its bond order and explain its magnetic property.

Very Short Answer type Questions

1. What is "Octet rule"?
2. Which of the two ions Ca+2 or Zn+2 is more stable and why?
3. How many sigma and pi bonds are present in
a) C2H2 and b) C2H4
4. If A and B are two different atoms when does AB molecule become covalent?
5. Boiling point of H2O is higher than HF. Why?
6. Why H2O has dipole moment while CO2 does not have?
7. Even though N in NH3 is in sp3 hybridizaiton, the HNH bond angle deviate from 109°28'. Why?
8. Define dipole moment.
9. NH3 has higher dipole moment compared to NF3. Why?
10. Be - F bonds are polar, but dipole moment of BeF2 is zero. Why?

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