- 1(current)
Q. No.In the given nuclear reaction, the element \(\mathrm{X}\) is:\({ }_{11}^{22} \mathrm{Na} \rightarrow \mathrm{X}+\mathrm{e}^{+}+\nu\)
| 1. | \({ }_{12}^{22} \mathrm{Mg}\) | 2. | \({ }_{11}^{23} \mathrm{Na}\) |
| 3. | \({ }_{10}^{23} \mathrm{Ne}\) | 4. | \(_{10}^{22}\textrm{Ne}\) |
Subtopic: Â Types of Decay |
 65%
From NCERT
NEET - 2022
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When a nucleus in an atom undergoes a radioactive decay, the electronic energy levels of the atom:
| 1. | do not change for any type of radioactivity |
| 2. | change for \(\alpha\) and \(\beta\text-\)radioactivity but not for \(\gamma\text-\)radioactivity |
| 3. | change for \(\alpha\text-\)radioactivity but not for others |
| 4. | change for \(\beta\text-\)radioactivity but not for others |
Subtopic: Â Types of Decay |
 75%
From NCERT
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Tritium is an isotope of hydrogen whose nucleus triton contains \(2\) neutrons and \(1\) proton. Free neutrons decay into\(p+e^{-1}+\nu^{-1}.\) If one of the neutrons in Triton decays, it would transform into \(\mathrm{He}^{3}\) nucleus. This does not happen. This is because:
| 1. | triton energy is less than that of a \(\mathrm{He}^{3}\) nucleus. |
| 2. | the electron created in the beta decay process cannot remain in the nucleus. |
| 3. | both the neutrons in Triton have to decay simultaneously resulting in a nucleus with \(3\) protons, which is not a \(\mathrm{He}^{3}\) nucleus. |
| 4. | free neutrons decay due to external perturbations which is absent in Triton nucleus. |
Subtopic: Â Types of Decay |
From NCERT
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Antineutrinos are emitted during:
1. \(\alpha\)-decay
2. \(\beta\)-decay
3. \(\gamma\)-decay
4. neutron emission
1. \(\alpha\)-decay
2. \(\beta\)-decay
3. \(\gamma\)-decay
4. neutron emission
Subtopic: Â Types of Decay |
 83%
From NCERT
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Atomic number increases in:
| 1. | \(\alpha\text-\)decay. |
| 2. | \(\beta^{-}\text-\)decay. |
| 3. | \(\beta^{+}\text{-}\)decay. |
| 4. | \(K\text{-}\)electron capture. |
Subtopic: Â Types of Decay |
 80%
From NCERT
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