From the metals copper, iron, magnesium, sodium and zinc, select from metal which does not react with cold water but reacts with steam when heated.

Explanation

To solve the question, we need to identify which metal from the list (copper, iron, magnesium, sodium, and zinc) does not react with cold water but reacts with steam when heated. Here’s the step-by-step solution:

### Step 1: Understand the Reactivity of Metals
Metals have different reactivities with water. Highly reactive metals like sodium react vigorously with cold water. Medium reactive metals may not react with cold water but can react with steam when heated.

### Step 2: Analyze Each Metal
- **Sodium (Na)**: Highly reactive, reacts vigorously with cold water.
- **Magnesium (Mg)**: Medium reactive; does not react with cold water but reacts with steam when heated.
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