What else is produced during the replacement reaction of magnesium and hydrochloric acid? Mg plus 2 HCl rightarrow cap h sub 2 plus ______

Magnesium replaces hydrogen in hydrochloric acid, producing hydrogen gas and magnesium chloride. Magnesium forms a 2+ ion, while chloride has a 1− charge, so the neutral compound is MgCl₂. The balanced reaction is Mg + 2HCl → H₂ + MgCl₂, so the answer is magnesium chloride, choice B.

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