Choose the reactions which are not feasible.
I. Iron+Zinc sulphate`to`Iron sulphate+Zinc
II. Magnesium+Silver nitrate`to`Magnesium nitrate+Silver
III. Copper+dil. Sulphuric acid`to` Copper sulphate+Hydrogen
IV. Zinc+Ferrous sulphate`to`Iron+Zinc sulphate

Options

A. I, II and III
B. III and IV only
C. I and III only
D. I, II, III and IV

Explanation

To determine which reactions are not feasible, we will analyze each reaction based on the reactivity series of metals. The reactivity series helps us understand which metals can displace others from their compounds.

### Step-by-Step Solution:

1. **Identify the Reactions:**
- I. Iron + Zinc Sulfate → Iron Sulfate + Zinc
- II. Magnesium + Silver Nitrate → Magnesium Nitrate + Silver
- III. Copper + Dilute Sulfuric Acid → Copper Sulfate + Hydrogen
- IV. Zinc + Ferrous Sulfate → Iron + Zinc Sulfate

2. **Analyze Each Reaction:**
- **Reaction I:** Iron + Zinc Sulfate → Iron Sulfate + Zinc
- In the reactivity series, Zinc (Zn) is more reactive than Iron (Fe). Therefore, Iron cannot displace Zinc from Zinc Sulfate.
- **Conclusion:** This reaction is **not feasible**.

- **Reaction II:** Magnesium + Silver Nitrate → Magnesium Nitrate + Silver
- Magnesium (Mg) is more reactive than Silver (Ag). Hence, Magnesium can displace Silver from Silver Nitrate.
- **Conclusion:** This reaction is **feasible**.

- **Reaction III:** Copper + Dilute Sulfuric Acid → Copper Sulfate + Hydrogen
- Copper (Cu) is less reactive than Hydrogen (H). Therefore, Copper cannot displace Hydrogen from Dilute Sulfuric Acid.
- **Conclusion:** This reaction is **not feasible**.

- **Reaction IV:** Zinc + Ferrous Sulfate → Iron + Zinc Sulfate
- Zinc (Zn) is more reactive than Iron (Fe). Thus, Zinc can displace Iron from Ferrous Sulfate.
- **Conclusion:** This reaction is **feasible**.

3. **Final Assessment:**
- The reactions that are not feasible are:
- Reaction I: Iron + Zinc Sulfate → Iron Sulfate + Zinc
- Reaction III: Copper + Dilute Sulfuric Acid → Copper Sulfate + Hydrogen

### Answer:
The reactions which are not feasible are **I and III**.