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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 determine the metal X that forms both an oxide and a nitride when burnt in air, we will analyze each of the given options one by one. ### Step-by-Step Solution: 1. **Understanding the Reaction**: - When a metal burns in air, it reacts with oxygen (O₂) to form an oxide and with nitrogen (N₂) to form a nitride. 2. **Analyzing Option 1: Magnesium (Mg)**: - When magnesium is burnt in air, it reacts with oxygen to form magnesium oxide (MgO). - Magnesium can also react with nitrogen to form magnesium nitride (Mg₃N₂). - Therefore, magnesium forms both an oxide and a nitride. - **Conclusion**: Magnesium is a possible candidate for metal X. 3. **Analyzing Option 2: Rubidium (Rb)**: - When rubidium is burnt in air, it reacts with oxygen to form rubidium oxide (Rb₂O). - However, rubidium does not readily react with nitrogen to form a stable nitride due to its low lattice energy, making the compound unstable. - **Conclusion**: Rubidium does not form both an oxide and a nitride, so it is not metal X. 4. **Analyzing Option 3: Sodium (Na)**: - When sodium is burnt in air, it reacts with oxygen to form sodium oxide (Na₂O). - Sodium also does not form a stable nitride due to low lattice energy, which makes the compound unstable. - **Conclusion**: Sodium does not form both an oxide and a nitride, so it is not metal X. 5. **Analyzing Option 4: Lithium (Li)**: - When lithium is burnt in air, it reacts with oxygen to form lithium oxide (Li₂O). - Lithium can also react with nitrogen to form lithium nitride (Li₃N). - Therefore, lithium forms both an oxide and a nitride. - **Conclusion**: Lithium is a possible candidate for metal X. 6. **Final Conclusion**: - Among the options analyzed, both magnesium (Mg) and lithium (Li) can form both an oxide and a nitride when burnt in air. However, if we are to select one, magnesium is the first option listed that satisfies the condition. ### Answer: The metal X that can form both an oxide and a nitride when burnt in air is **Magnesium (Mg)**.
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