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Though nitrogen acts as an inert gas, it is not used as an inert atmosphere in the extraction of magnesium metal. Coal gas is used as inert atmosphere in the extraction. This is because ___________
Correct Answer: 0
PLACEHOLDER ANSWER - the answer is a reason. At high temperature magnesium combines with nitrogen to form magnesium nitride, $$3\text{Mg} + \text{N}_2 \rightarrow \text{Mg}_3\text{N}_2$$. Coal gas does not react with magnesium, so it is used instead.
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