Which of the following metals occurs in free state in nature ?

Options

A. aluminium
B. Calcium
C. Gold
D. Sodium

Explanation

To determine which metal occurs in a free state in nature, we need to consider the reactivity of metals. Here's a step-by-step solution:

### Step 1: Understand the Concept of Free State
- Metals can be found in nature in two forms: in their free state (uncombined with other elements) or in combined forms (as ores).
- Metals that are less reactive are more likely to be found in their free state.

### Step 2: Identify the Reactivity Series
- The reactivity series ranks metals based on their reactivity, from most reactive to least reactive.
- Some common metals in the reactivity series include:
1. Sodium (very reactive)
2. Calcium (reactive)
3. Aluminum (reactive)
4. Gold (least reactive)

### Step 3: Determine Which Metal is Least Reactive
- From the reactivity series, we can see that gold is the least reactive metal listed.
- Metals such as sodium, calcium, and aluminum are more reactive and are typically found in combined forms (as ores).

### Step 4: Conclusion
- Since gold is the least reactive, it is the metal that occurs in a free state in nature.

### Final Answer
- The metal that occurs in a free state in nature is **Gold**.

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