Verified Answer :

The answer should be A.  The metal will replace the hydrogen as the cation which will result in the a salt and hydrogen gas.  An example is Mg reacting with HCl which produces MgCl₂ (salt) and H₂ (hydrogen).

I hope this helps.  Let me know if anything is unclear.

Answer: Option (a) is the correct answer.

Explanation:

When an acid reacts with a metal then there occurs formation of a salt along with liberation of hydrogen gas.

For example, \(Zn + 2HCl \rightarrow ZnCl_{2} + H_{2}\)

Here, Zn (zinc) is the metal which when added to hydrogen chloride acid them it leads to the formation of salt zinc chloride and hydrogen gas.

This type of reaction is also known as single displacement reaction.

Thus, we can conclude that salt and hydrogen is produced when an acid reacts with a metal.

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