Chapter 3 Chemistry-I
1. Derive radius, energy, frequency and wave number of nth orbit of hydrogen atom.
2. What are assumptions of Bohr’s atomic theory? How does it account for hydrogen spectrum?
3. State:
i)
Aufbau principle
ii)
n + l rule
iii)
Hund’s rule
iv)
Pauli’s exclusion principle with significance
v)
Heisenberg’s uncertainty principle
4. Explain Rutherford’s Experiment, assumptions and defects of his atomic model.
5. How were neutrons discovered?
6. Compare properties of alpha, beta and gamma rays.
7. Describe the experiment explaining the passage of electricity through gases at low pressure.
8. Define: i) electron affinity ii) ionization potential iii) quantum numbers
9. Give shapes of orbitals of second shell.
10. Write down names of spectral lines of hydrogen atom.
11. Differentiate between:
i)
orbit and orbital
ii)
natural radioactivity and artificial radioactivity
12. Give reasons:
i)
2nd ionization potential of sodium is very high
ii)
An orbital can have two electrons with opposite spin
iii)
ionization potential of oxygen is smaller than that of nitrogen.
13. Write down electronic configuration of:
i)
Mo (Z=42)
ii)
Ag (Z=47)
iii)
Na (Z=11)
iv)
B (Z=5)
14. Arrange according to n+l rule: 4d,7s,4f
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