Radio-activity can be detected in hydrogn due to the presence of

Options

A. (A) `._(1)^(1)H`
B. (B) `._(1)^(2)H`
C. (C) `._(1)^(3)H`
D. (D) `He`

Answer

To solve the question "Radioactivity can be detected in hydrogen due to the presence of," we will analyze the isotopes of hydrogen and determine which one is radioactive.

### Step-by-Step Solution:

1. **Identify the Isotopes of Hydrogen**:
- Hydrogen has three main isotopes:
- Protium (¹H₁)
- Deuterium (²H₁)
- Tritium (³H₁)

2. **Examine Protium (¹H₁)**:
- Protium is the most common isotope of hydrogen, consisting of one proton and no neutrons.
- Since it has no neutrons, it is stable and not radioactive.

3. **Examine Deuterium (²H₁)**:
- Deuterium has one proton and one neutron.
- It is also stable and not radioactive. Deuterium is found in small amounts compared to protium and is often associated with heavy water (D₂O).

4. **Examine Tritium (³H₁)**:
- Tritium consists of one proton and two neutrons.
- This isotope is radioactive due to its instability. The presence of two neutrons makes it prone to decay, emitting beta particles in the process.

5. **Conclusion**:
- Since only Tritium (³H₁) is radioactive among the isotopes of hydrogen, we conclude that radioactivity can be detected in hydrogen due to the presence of Tritium.

### Final Answer:
Radioactivity can be detected in hydrogen due to the presence of Tritium (³H₁).

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