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Well, we might as well try a similar question. Magnesium metal reacts with hydrochloric acid to produce hydrogen gas and an aqueous solution of magnesium (II) chloride. What substance is being oxidized. A)H2(g) B)MgCl2(aq) C)HCl(aq) D)Mg(s)

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Answer:
Mg is being oxidized.

Step-by-step explanation:

The chemical equation for magnesium metal reacts with hydrochloric acid to produce hydrogen gas and an aqueous solution of magnesium (II) chloride.


Mg(s)+2HCl\rightarrow MgCl_2(aq)+H_2(g)

Oxidation reaction : When there is a loss of electrons and an increase in oxidation state number.


Mg\rightarrow Mg^(2+)+2e^-

Reduction reaction : when there is gain of electrons and a decrease in oxidation state number.


2H^(+)+2e^-\rightarrow H_2

Thus
Mg is being oxidized.

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