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

1. Brackett series

2. Lyman series

3. Balmer series

4. Paschen series

Subtopic:  Hydrogen Spectra |
 82%
From NCERT
NEET - 2019
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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 |
 67%
From NCERT
NEET - 2019
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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 |
 62%
From NCERT
AIPMT - 2006
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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 0.1 Å 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 |
 52%
From NCERT
AIPMT - 2006
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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 |
 67%
From NCERT
AIPMT - 2007
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Consider the following sets of quantum numbers: 
 
Which of the following sets of quantum numbers 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 |
 86%
From NCERT
AIPMT - 2007
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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 |
 70%
From NCERT
AIPMT - 2008
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If uncertainty in position and momentum are equal, then the uncertainty in velocity is:

1. 12mhπ

2. h2π

3. 1mhπ

4. hπ

Subtopic:  Heisenberg Uncertainty Principle |
 80%
From NCERT
AIPMT - 2008
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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 |
 86%
From NCERT
AIPMT - 2009
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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 |
 68%
From NCERT
AIPMT - 2009
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