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Given below are two statements:
Assertion (A):
The wavelength of the Kα characteristic X-ray of an unknown element is \(2.289×10^{−8} cm\), and its atomic number is 26.
Reason (R):
According to Moseley's law, the frequency of a characteristic X-ray is directly proportional to the square of the atomic number of the element.
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 |
Level 4: Below 35%
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Hints
Calculate the wavelength emitted during the transition of electron in between two levels of Li2+ ion whose sum is 4 and difference is 2 ?
1. 3.14 x 10-6 cm
2. 1.14 x 10-5 cm
3. 3.14 x 10-6 m
4. 1.14 x 10-6 cm
Subtopic: Hydrogen Spectra |
54%
Level 3: 35%-60%
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Hints
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Correct sequence of the increasing order of effective nuclear charge (Zeff) of s, p and d sub-shells is -
1. d = p < s
2. d < p < s
3. d > p < s
4.d < p > s
1. d = p < s
2. d < p < s
3. d > p < s
4.d < p > s
Subtopic: Shell & Subshell |
86%
Level 1: 80%+
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Hints
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Correct distribution of electrons in oxygen atom using orbital diagram among the following is -
1.
2.
3.
4.
1.
2.
3.
4.
Subtopic: Pauli's Exclusion Principle & Hund's Rule |
89%
Level 1: 80%+
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Hints
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Correct electronic configuration of Ni+2 ion among the following is:
1. 4s03d8
2. 4s23d6
3. 4s23d10
4. 4s13d5
1. 4s03d8
2. 4s23d6
3. 4s23d10
4. 4s13d5
Subtopic: AUFBAU Principle |
80%
Level 1: 80%+
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Hints
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Subtopic: Shell & Subshell |
79%
Level 2: 60%+
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The number of angular nodes and radial nodes present in 3p orbital is respectively-
1. 2,3
2. 1,1
3. 1, 2
4. 2,1
1. 2,3
2. 1,1
3. 1, 2
4. 2,1
Subtopic: Nodal Plane |
80%
Level 1: 80%+
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Subtopic: Shell & Subshell |
79%
Level 2: 60%+
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The particle among the following does not show deflection from the path on passing through an electric field is -
1. Proton
2. Cathode rays
3 . Electron
4. Neutron
1. Proton
2. Cathode rays
3 . Electron
4. Neutron
Subtopic: Introduction of Atomic Structure |
75%
Level 2: 60%+
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The atomic number of the atom having atomic mass number 13 has 7 neutrons is:
1. 13
2. 7
3. 6
4. 8
1. 13
2. 7
3. 6
4. 8
Subtopic: Number of Electron, Proton & Neutron |
87%
Level 1: 80%+
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