Arrange the following metal in the increasing order of their reactivity towards water, Zinc, Iron, Magnesium, Sodium

Options

A. iron `lt` magnesium `lt` sodium `lt` zinc
B. iron `lt` zinc `lt` magnesium `lt` sodium
C. magnesium `lt` iron `lt` sodium `lt` zinc
D. sodium `lt` iron `lt` magnesium `lt` zinc

Answer

To arrange the metals Zinc, Iron, Magnesium, and Sodium in the increasing order of their reactivity towards water, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Reactivity with Water**: Metals react with water to form hydroxides and release hydrogen gas. The reactivity of metals with water increases as we move down the reactivity series.

2. **Reference to Reactivity Series**: The reactivity series is a list of metals arranged in order of decreasing reactivity. Metals that are higher in the series will displace metals that are lower from their compounds and will react more vigorously with water.

3. **Identify the Position of Each Metal**:
- **Sodium (Na)**: Highly reactive with water, reacts vigorously.
- **Magnesium (Mg)**: Reacts with water but less vigorously than sodium.
- **Zinc (Zn)**: Reacts with steam or hot water but not with cold water.
- **Iron (Fe)**: Reacts very slowly with water and requires the presence of oxygen (rusting) to react.

4. **Arrange the Metals**: Based on their reactivity towards water, we can arrange the metals in increasing order of reactivity:
- Iron (Fe) - least reactive
- Zinc (Zn) - more reactive than iron but less than magnesium
- Magnesium (Mg) - more reactive than zinc
- Sodium (Na) - most reactive

5. **Final Order**: Therefore, the increasing order of reactivity towards water is:
- Iron < Zinc < Magnesium < Sodium

### Final Answer:
Iron < Zinc < Magnesium < Sodium