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The correct answer among the choices given above is the last option. When an acid reacts with an active metal, hydrogen gas is produced. The hydrogen in acid is displaced by the metal yielding hydrogen gas.

Mg + 2HCl = MgCl2 + H2

Answer: The correct answer is hydrogen gas is produced.

Explanation:

Metals are defined as the elements which loose electrons to attain stability.

Acid is defined as the substance which releases hydrogen ions when dissolved in water. It is represented as HA.

When an active metal reacts with an acid, it leads to the production of a salt and released hydrogen gas. General equation representing this reaction follows:

\(2HA+2M\rightarrow 2MA+H_2\)

For Example: Reaction of zinc metal with HCl, the equation follows:

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)

Hence, the correct answer is hydrogen gas is produced.

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