In Bohr's model, the quantized angular momentum of electron means;

1. there can be no fractional value of h/2π
2. there can be fractional value of h/2π
3. there are no certain discrete values of h/2π
4. none of these
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Answer: A
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Bohr′s model of atom is contradicted by:

1. Quantization of angular momentum
2. Heisenberg uncertainty principle
3. Quantization of energy of electrons
4. Planck′s quantum theory
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Answer: B
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Bohr's radius for hydrogen atom is;

1. 0.329 Å
2. 0.229 Å
3. 0.529 Å
4. 0.729 Å
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Answer: C
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According to Bohr′s model, the radius of the second orbit is:

1. 0.529 Å
2. 4 x 0.529 Å
3. 8 x 0.529 Å
4. 2 x 0.529 Å
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Answer: B
Explanation:
• Since r_n = 0.529 Å (n²)
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The distance gap between adjacent orbits of H-atom from the lower to higher orbits;

1. go on increasing
2. go on decreasing
3. remains the same
4. can't be predicted
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Answer: A
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The energy of electron as we move away from the nucleus;

1. remains the same
2. decreases
3. increases
4. may increase or decrease
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Answer: C
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Lyman series is obtained when an electron jumps from higher energy level to;

1. 2nd level
2. 3rd level
3. 4th level
4. Ground level
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Answer: D
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Lines of Balmer series are obtained when an electron jumps from higher orbit to ----- orbit;

1. 1st
2. 2nd
3. 3rd
4. Ground level
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Answer: B
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A Line of Paschen series is obtained when an electron from higher energy level returns to;

1. 1st orbit
2. 2nd orbit
3. 3rd orbit
4. 4th orbit
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Answer: C
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Brackett series is obtained when an electron jumps from higher energy level to;

1. 2nd level
2. 3rd level
3. 4th level
4. Ground level
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Answer: C
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