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A metal X when burnt in air ,X -forms ox...

A metal X when burnt in air ,X -forms oxide and nitride both , X can be

A

Mg

B

Rb

C

Na

D

Li

Text Solution

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The correct Answer is:
To solve the question "A metal X when burnt in air, X forms oxide and nitride both, X can be," we will analyze the given options to identify the correct metal. ### Step-by-Step Solution: 1. **Understanding the Question**: We need to find a metal (X) that, when burned in air, forms both an oxide and a nitride. 2. **Analyzing the Options**: - **Option 1: Mg (Magnesium)** - When magnesium is burned in air, it reacts with both nitrogen (N2) and oxygen (O2). - The reactions are: \[ 2Mg + O2 \rightarrow 2MgO \quad (\text{forms oxide}) \] \[ 3Mg + N2 \rightarrow Mg3N2 \quad (\text{forms nitride}) \] - Thus, magnesium forms both an oxide (MgO) and a nitride (Mg3N2). This option is valid. - **Option 2: Rb (Rubidium)** - When rubidium is burned in air, it does not form a nitride or an oxide effectively. - Therefore, this option is incorrect. - **Option 3: Na (Sodium)** - When sodium is burned in air, it reacts with oxygen and nitrogen: \[ 4Na + O2 \rightarrow 2Na2O \quad (\text{forms oxide}) \] \[ 6Na + N2 \rightarrow 2Na3N \quad (\text{forms nitride}) \] - However, the formation of sodium nitrate (NaNO3) is not relevant here, and it does not form both oxide and nitride in a straightforward manner. This option is incorrect. - **Option 4: Li (Lithium)** - When lithium is burned in air, it primarily forms lithium oxide (Li2O) and does not effectively form a nitride under normal conditions. - Therefore, this option is also incorrect. 3. **Conclusion**: The only metal that forms both an oxide and a nitride when burned in air is **Magnesium (Mg)**. ### Final Answer: Metal X can be **Mg (Magnesium)**.
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