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Q. No.Given below are two statements:
Assertion (A):
For n=3, l maybe 0,1 and 2 and m maybe 0; \(\pm\)1 and \(\pm\)2
Reason (R):
For each value of n, there are 0 to (n-1) possible values of l; and for each value of l, there are 0 to \(\pm\)l values of m.
1.
Both (A) and (R) are True and (R) is the correct explanation of (A).
2.
Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.
(A) is True but (R) is false.
4.
(A) is False but (R) is True.
Subtopic: Quantum Numbers & Schrodinger Wave Equation |
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Given below are two statements:
In the light of the above statements, choose the correct answer from the option 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.
| Statement I: |  h\(\)v = (E2-E1) absorbs a photon. |
| Statement II: |  hv = (E2-E1) = emitted a photon. |
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 | Hydrogen Spectra |
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Using the following statements, identify the correct set of statements:
1. (i), (ii), (iii)
2. (i), (ii), (iv)
3. (i), (ii), (iii), (iv)
4. (i), (iii), (iv)
| (i). | n (principal quantum number) can have values 1, 2, 3, 4, ....... |
| (ii). | The number of orbitals for a given value of l is (2l+1). |
| (iii). | The value of spin quantum numbers is always \(\pm\frac12\). |
| (iv). | For l=5, the total number of orbitals is 9. |
1. (i), (ii), (iii)
2. (i), (ii), (iv)
3. (i), (ii), (iii), (iv)
4. (i), (iii), (iv)
Subtopic: Quantum Numbers & Schrodinger Wave Equation |
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The correct relation between the radius of 3rd and 4th Bohr orbit for H-atom is:
1. \(\frac{r_3}{r_4}=\frac{16}{9} \)
2. \(\frac{r_3}{r_4}=\frac{9}{16} \)
3. \(\frac{r_3}{r_4}=\frac{9}{4} \)
4. \(\frac{r_3}{r_4}=\frac{3}{16} \)
1. \(\frac{r_3}{r_4}=\frac{16}{9} \)
2. \(\frac{r_3}{r_4}=\frac{9}{16} \)
3. \(\frac{r_3}{r_4}=\frac{9}{4} \)
4. \(\frac{r_3}{r_4}=\frac{3}{16} \)
Subtopic: Hydrogen Spectra |
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The threshold frequency of a metal is \(1.4 \times 10^{15}sec^{-1}\). Calculate the minimum energy required to eject a photoelectron from this metal.
[Given: Planck’s constant, \(h = 6.6 \times 10^{-34} J sec\)]
2. \(9.24 \times 10^{-18}J \)
3. \(4.62 \times 10^{-19}J \)
4. \(4.62 \times 10^{-18}J \)
Subtopic: Photo Electric Effect |
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Which of the following sets of quantum numbers are not possible?
| 1. | \(n=1,l=0,m_l=0,m_s=-\frac12 \) |
| 2. | \(n=1,l=1,m_l=0,m_s=+\frac12 \) |
| 3. | \(n=2,l=1,m_l=0,m_s=+\frac12 \) |
| 4. | \(n=3,l=1,m_l=0,m_s=+\frac12 \) |
Subtopic: Quantum Numbers & Schrodinger Wave Equation |
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The radius (in Å) of the 3rd Bohr orbit in Li2+ ion is closest to:
[Given: Atomic number of Li = 3]
1. 0.520
2. 1.018
3. 1.587
4. 1.881
[Given: Atomic number of Li = 3]
1. 0.520
2. 1.018
3. 1.587
4. 1.881
Subtopic: Bohr's Theory |
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Match List-I with List-II:
Choose the correct answer from the options given below:
| List-I (quantum number) |
List-II (Orbital) |
||
| (A) | n = 2, \(\ell\) = 1 | (I) | 2s |
| (B) | n = 3, \(\ell\) = 2 | (II) | 3s |
| (C) | n = 3, \(\ell\) = 0 | (III) | 2p |
| (D) | n = 2, \(\ell\) = 0 | (IV) | 3d |
| (A) | (B) | (C) | (D) | |
| 1. | (III) | (IV) | (I) | (II) |
| 2. | (IV) | (III) | (I) | (II) |
| 3. | (IV) | (III) | (II) | (I) |
| 4. | (III) | (IV) | (II) | (I) |
Subtopic: Shell & Subshell |
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NEET - 2022
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Which scenario leads to the maximum exchange of energy?
1. \(d^1\)
2. \(d^3\)
3. \(d^5\)
4. \(d^4\)
1. \(d^1\)
2. \(d^3\)
3. \(d^5\)
4. \(d^4\)
Subtopic: Pauli's Exclusion Principle & Hund's Rule | AUFBAU Principle |
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The de-Broglie wavelength of a moving object having a mass 10 g and a velocity of 500 ms-1 will be:
1. 6.63 × 10-34 m
2. 3.18 × 10-36 m
3. 1.32 × 10-34 m
4. 2.46 × 10-32 m
1. 6.63 × 10-34 m
2. 3.18 × 10-36 m
3. 1.32 × 10-34 m
4. 2.46 × 10-32 m
Subtopic: De Broglie Equation |
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