Isotope of an element contains \(19.23 \%\) more neutrons as compared to protons. The correct element along with its mass number is:
(Given Atomic number \(\mathrm{Fe: 26, Co: 27}\) )

1. \(\mathrm {^{56}Fe }\)
2. \({ }^{57} \mathrm{Fe}\)
3. \({ }^{57} \mathrm{Co}\)
4. \({ }^{60} \mathrm{Co}\)

Subtopic:  Number of Electron, Proton & Neutron |
 58%
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NEET - 2024
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Given below are two statement:
Statement I: The energy of the \(\mathrm{He}^{+}\) ion in \(n=2\) state is same as the energy of H atom in \(n=1\) state
Statement II: It is possible to determine simultaneously the exact position and exact momentum of an electron in \(\mathrm{H}\) atom.

In the light of the above Statements, choose the correct answer from the options given below:
1. Both Statement I and Statement II are True
2. Both Statement I and Statement II are False
3. Statement I is True but Statement II is False
4. Statement I is False but Statement II is True
Subtopic:  Bohr's Theory | Heisenberg Uncertainty Principle |
 73%
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NEET - 2024
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Match List I with List II.
List I
Quantum Number
List II
Information provided
A. ml                                     I.         Shape of the orbital
B. ms II. Size of the orbital
C. l III. Orientation of the orbital
D. n IV. Orientation of spin of the electron
Choose the correct answer from the options given below:
1. A-III, B-IV, C-I, D-II
2. A-III, B-IV, C-II, D-I
3. A-II, B-I, C-IV, D-III
4. A-I, B-III, C-II, D-IV
Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 76%
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The energy of electron in the ground state \((\text{n}=1)\) for \(\text{He}^+\) ion is \(\text{x}J,\) then that for an electron in \(\text{n}=2\) state for \(\text{Be}^{3+}\) ion in \(\text{J}\) is :
1. \(-\dfrac x9\) 2. \(-4x\)
3. \(-\dfrac 49x\) 4. \(-x\)
Subtopic:  Bohr's Theory |
 67%
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NEET - 2024
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The first four electron energy levels of an atom are shown below, given in terms of electron volts. Which of the following gives the energy of a photon that could NOT be emitted by this atom?

   E4 = −18 eV
   E3 = −32 eV
   E2 = −72 eV
   E1 = −288 eV

1. 14 eV
2. 40 eV
3. 44 eV
4. 54 eV
Subtopic:  Photo Electric Effect |
 53%
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Given below are two statements: 
Statement I: The value of wave function, \(\Psi\) depends upon the coordinates of the electron in the atom. 
Statement II: The probability of finding an electron at a point within an atom is proportional to the orbital wave function. 
In light of the above statements, choose the correct answer from the options given below: 
1. Statement I is True but Statement II is False.
2. Statement I is False but Statement II is True.
3. Both Statement I and Statement II are True.
4. Both Statement I and Statement II are False.
Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
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NEET - 2023
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Incorrect set of quantum numbers from the following is :

1. n=4,l=3, m1 =-3, -2, -1, 0, +1, +2, +3, ms=-1/2
2. n=5, l=2, m1 =-2, -1, +1, +2, ms=+1/2
3.  n=4, l=2, m1 = -2, -1, 0, +1, +2, ms=-1/2
4.  n=5,l=3, m1 =-3, -2, -1, 0, +1, +2, +3, ms=+1/2
Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 82%
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NEET - 2023
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The relation between \(n_m \) (\(n_m \) = number of permissible values of magnetic quantum number (ml) for a given value of azimuthal quantum number (l) is: 

1. \(n_m = l+2\)
2. \(l = {\dfrac{n_m -1} 2}\)
3. \(l= 2n_m +1\)
4. \(n_m = 2l^2 + 1 \)
Subtopic:  Shell & Subshell |
 69%
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NEET - 2023
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Match List I with List II
 
List I List II
Different regions of the spectrum Frequencies
I. Radiofrequency A. 106 Hz
II. Microwave B. 1013 Hz
III. Ultraviolet Region C. 1010 Hz
IV. Infra-red Region D. 1016 Hz

Choose the correct answer from the options given below: 

1. I-B; II-A; III-C; IV-D
2. I-A; II-C; III-D; IV-B
3. I-D; II-B; III-A; IV-C
4. I-B; II-C; III-D; IV-A

Subtopic:  Electromagnetic Radiation |
 75%
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When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 × 105 J mol–1. The minimum energy needed to remove one mole of electron from the metal is: 

(h = 6.626 × 10–34 Js, c = 3 × 108 ms–1, NA = 6.022 × 1023 mol–1)

1.  2.31 × 106 J mol–1
2.  3.84 × 104 J mol–1
3.  3.84 × 10–19 J mol–1
4.  2.31 × 105 J mol–1
Subtopic:  Photo Electric Effect |
From NCERT
NEET - 2022
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