In the fission of `U^235`
(i) Slow neutron is absorbed by `U^235`
(ii) The products in the process are not same always, their atomic number varies from 34 to 58
(iii) About 200 Mev energy is released per fission
(iv) The product are always Ba and Kr

Options

A. Only i, ii & iii are true
B. Only ii & iii are true
C. All are true
D. Only i, ii & iv are true

Answer

To solve the question regarding the fission of Uranium-235 (U-235), we will analyze each statement provided in the question step by step.

### Step 1: Analyze Statement (i)
**Statement:** Slow neutron is absorbed by U-235.

**Analysis:**
In nuclear fission, a slow (thermal) neutron is indeed absorbed by U-235. This absorption leads to the formation of an unstable compound nucleus, which eventually undergoes fission. Therefore, this statement is **true**.

### Step 2: Analyze Statement (ii)
**Statement:** The products in the process are not always the same; their atomic number varies from 34 to 58.

**Analysis:**
When U-235 undergoes fission, it can produce various fission products. While barium (Ba) and krypton (Kr) are common products, other isotopes can also be formed, leading to a range of atomic numbers. The atomic numbers of the fission products can indeed vary and typically fall within the range of 34 to 58. Thus, this statement is also **true**.

### Step 3: Analyze Statement (iii)
**Statement:** About 200 MeV energy is released per fission.

**Analysis:**
The fission of U-235 releases a significant amount of energy, approximately 200 MeV (mega-electron volts) per fission event. This energy release is one of the key aspects of nuclear fission and is well-documented in nuclear physics. Therefore, this statement is **true**.

### Step 4: Analyze Statement (iv)
**Statement:** The products are always Ba and Kr.

**Analysis:**
While barium and krypton are common fission products of U-235 fission, it is not accurate to say that they are the only products. Other isotopes can also be produced, and thus, the statement that the products are "always" Ba and Kr is **false**.

### Conclusion
Based on the analysis:
- Statement (i) is true.
- Statement (ii) is true.
- Statement (iii) is true.
- Statement (iv) is false.

Thus, the correct option is that only statements 1, 2, and 3 are true.

### Final Answer
The correct option is: **Only 1, 2, and 3 are true.**

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