The correct order of increasing chemical reactivity is

Options

A. `Zn lt Fe lt Mg lt K`
B. `Fe lt Mg lt Zn lt K`
C. `Fe lt Mg lt K lt Zn`
D. `Fe lt Zn lt Mg lt K`

Explanation

To determine the correct order of increasing chemical reactivity among the metals Zinc, Iron, Magnesium, and Potassium, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Reactivity Series**: The reactivity series is a list of metals arranged in order of decreasing reactivity. The more reactive a metal is, the more readily it will react with other substances.

2. **Identify the Position of Each Metal**:
- From the reactivity series:
- Potassium (K) is at the top, indicating it is the most reactive.
- Magnesium (Mg) comes next.
- Zinc (Zn) follows Magnesium.
- Iron (Fe) is lower on the list, indicating it is the least reactive among these four metals.

3. **Arrange the Metals in Increasing Order of Reactivity**:
- Based on their positions in the reactivity series:
- Iron (Fe) has the lowest reactivity.
- Zinc (Zn) is next.
- Magnesium (Mg) follows Zinc.
- Potassium (K) is the most reactive.

4. **Write the Final Order**:
- The increasing order of reactivity is:
- Iron < Zinc < Magnesium < Potassium

5. **Select the Correct Option**:
- If given multiple-choice options, the correct choice that reflects this order is option D: Iron, Zinc, Magnesium, Potassium.

### Final Answer:
The correct order of increasing chemical reactivity is: **Iron < Zinc < Magnesium < Potassium** (Option D).

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