Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

1.  Brackett series

2.  Lyman series

3.  Balmer series

4.  Paschen series

Subtopic:  Hydrogen Spectra |
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4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

1.  5f>6p>4d>5p

2.  5f>6p>5p>4d

3.  6p>5f>5p>4d

4.  6p>5f>4d>5p

Subtopic:  AUFBAU Principle |
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The orientation of an atomic orbital is governed by :

1. azimuthal quantum number

2. spin quantum number

3. magnetic quantum number

4. principal quantum number

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
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If the mass of electron is 9.11×10-31 kg  and the planck's constant is 6.626 ×10-34 Js, then the uncertainty involved in the measurement of velocity within a distance of 0.1Å is :

1. 5.79×106 ms-1

2. 5.79×107 ms-1

3. 5.79×108 ms-1

4. 5.79×105 ms-1

Subtopic:  Heisenberg Uncertainty Principle |
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An element X has the following isotopic composition : 
200X: 90% 
199X: 8.0% 
202X: 2.0% 
The weighted average atomic mass of the naturally-occurring element X is closest to:

1. 200 amu
2. 201 amu
3. 202 amu
4. 199 amu

Subtopic:  Number of Electron, Proton & Neutron |
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Consider the following sets of quantum numbers : 
 
Which of the following sets of quantum number is not possible?

1. ii, iii and iv
2. i, ii, iii and iv
3. ii, iv and v
4. i and iii

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
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The measurement of the electron position is associated with uncertainty in momentum, which is equal to 1 x 10-18 g cm s-1. The uncertainty in electron velocity will be (mass of an electron is 9 x 10-28 g)-

1. 2 x 109 cm s-1
2. 1 x 109 cm s-1
3. 1 x 105 cms-1
4. 1 x 1011 cm s-1

Subtopic:  Heisenberg Uncertainty Principle |
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If uncertainty in position and momentum are equal, then uncertainty in velocity is:

1.  12mhπ

2.  h2π

3.  1mhπ

4.  hπ

Subtopic:  Heisenberg Uncertainty Principle |
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The incorrect set of quantum numbers among the following is
1. n= 4, l= 0, m= 0, s= -1/2
2. n= 5, l= 3, m= 0, s= +1/2
3. n= 3, l= 2, m= -3, s= -1/2
4. n= 3, l= 2, m= 2, s= -1/2

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
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The rule used to determine the maximum number of electrons in a subshell of an atom is

1. 4l+2

2. 2l+1

3. 4l-2

4. 2n2

Subtopic:  Shell & Subshell |
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