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Nitrogen is normally used to maintain an...

Nitrogen is normally used to maintain an inert atmosphere in metallurgical operations. Why is helium used for the reduction of `TiCl_(4)` with Mg metal ?

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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 Mg +N_(2) overset("heat")to underset("Mag. nitride")(Mg_(3)N_(2))`
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