An acid is "A substance that increases the concentration of [tex]H^{+}[/tex] ions when dissolved".
What is acid?
Acid will be considered as a substance that reacts with some of these metals to produce salts and releases hydrogen ions into water. Acids give certain dyes a reddish tint and will have a sour flavor.
What is substance?
A chemical substance would be a type of matter with a predictable chemical composition but also physical characteristics.
An acid is "A substance that increases the concentration of [tex]H^{+}[/tex] ions when dissolved".
Therefore, the correct answer will be an option (A)
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