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Calcination

When an inert...

Question

When an inert atmosphere is needed for a metallurgical process, nitrogen is frequently used. However, in the reduction of $T i C l_{4}$ by magnesium, helium is used. This is because $N_{2}$ can combine with _____.

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Solution

Nitrogen combines with magnesium upon heating to form magnesium nitride. It cannot be used to provide an inert atmosphere in this case. Therefore, helium [He] a noble gas is used to provide the inert atmosphere
$2 M g + N_{2} Δ \to M g_{3} N_{2}$

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