The electronic transition in the hydrogen atom that emits maximum energy is:

1. 2  1

2. 1  4

3. 4  3

4. 3  2

Subtopic:  Hydrogen Spectra |
 66%
Level 2: 60%+
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If the size of the first orbit of the hydrogen atom is 5.29 nm, the size of the second orbit of He+ is

1. 2.65 nm

2. 21.16 nm

3. 10.58 nm

4. 5.29 nm

Subtopic:  Bohr's Theory |
 72%
Level 2: 60%+
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 When an electron jumps from n=5 to n=1 in a hydrogen atom, the number of spectral lines obtained is 

1. 3 2. 4
3. 6 4. 10
Subtopic:  Hydrogen Spectra |
 75%
Level 2: 60%+
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What is the correct family and electronic configuration for element Z = 114?

1. Halogen family, [Rn]5f146d107s27p5

2. Carbon family, [Rn]5f146d107s27p2

3. Oxygen family, [Rn]5f146d107s27p4

4. Nitrogen family, [Rn]5f146d107s27p6

Subtopic:  AUFBAU Principle |
 78%
Level 2: 60%+
NEET - 2017
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If uncertainty in position and momentum are both equal, what will the uncertainty in velocity be?
1. \(\dfrac{1}{2 m} \sqrt{\dfrac{h}{\pi}}\) 2. \(\sqrt{\dfrac{h}{2 \pi}}\)
3. \(\dfrac{1}{m} \sqrt{\dfrac{h}{\pi}}\) 4. \(\dfrac{h}{\pi}\)
Subtopic:  Heisenberg Uncertainty Principle |
 78%
Level 2: 60%+
NEET - 2008
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Consider the following sets of quantum numbers:

              n         l         m         s

(i)         3         0         0          +1/2

(ii)        2         2         1          +1/2

(iii)       4         3        -2           -1/2

(iv)       1         0        -1           -1/2

(v)        3         2         3           +1/2

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 |
 85%
Level 1: 80%+
NEET - 2007
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An electronic configuration representing an atom in the excited state is: 

1. 1s2,2s22p1                     
2. 1s2,2s22p2
3. 1s2,2s22p2,3s1             
4. 1s2,2s22p5

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
 82%
Level 1: 80%+
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Incorrect statement among the following is: 

1. The uncertainty principle is\(\Delta x \cdot \Delta p \geq \dfrac{h}{4 \pi} \)
2. Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry, and a more balanced arrangement.
3. The energy of the 2s orbital is less than the energy of the 2p orbital in the case of hydrogen-like atoms.
4. De-Broglie's wavelength is given by\(\lambda=\dfrac{h}{m v} \), where m= mass of the particle, v = group velocity of the particle.
Subtopic:  De Broglie Equation |
 70%
Level 2: 60%+
NEET - 2017
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The incorrect statement among the following is:

1. Total orbital angular momentum of an electron in 's' orbital is equal to zero.
2. An orbital is designated by three quantum numbers, while an electron in an atom is designated by four quantum numbers.
3. The electronic configuration of N atom is 
4. The value of m for dz2 is zero.
Subtopic:  AUFBAU Principle |
 80%
Level 1: 80%+
NEET - 2018
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The correct set of four quantum numbers for the valence electron of a rubidium atom (Z =37) is: 

1. \(5,1,1,+ {1 \over2}\) 2. \(6,0,0,+ {1 \over2}\)
3. \(5,0,0,+ {1 \over2}\) 4. \(5,1,0,+ {1 \over2}\)
Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 80%
Level 1: 80%+
AIPMT - 2012
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