Thank you for posting your question here. To answer that question, an acid is a substance that contains hydrogen. It usually has a sour taste and also can able to neutralize alkali and reddening blue litmus paper. The hydrogen that it contains can be replaced by a metal.
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this is the answer explanation of previous question. as what you say in comment i do that
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B. The products are nuclei of elements that are different from the original elements.
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The nucleus of an atom consists of Protons and Neutrons.-A.