Answer :
Final answer:
Magnesium reacts with oxygen in the air to form a white powder which is magnesium oxide. This is due to a process known as passivation. Therefore, magnesium has joined with oxygen to form the white powder in question.
Explanation:
The white powder you are referring to likely formed from the reaction between magnesium and oxygen in the air. When magnesium is exposed to the atmosphere, it typically reacts with oxygen to form a white powder called magnesium oxide. This is due to a process known as passivation, where a tightly adhering layer of magnesium oxycarbonate forms on the surface of the metal and inhibits further reaction. Magnesium and oxygen combine in a chemical reaction to produce this substance. Therefore, in the set of options you provided, magnesium has joined with oxygen (Option B), not chlorine, hydrogen or magnesium oxide.
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