Question:

Carbon reacts with an acid to form carbon dioxide, water and nitrogen dioxide.
(a) Name the acid used in the reaction.
(b) Write a balanced chemical equation for the reaction that occurs.

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Concentrated nitric acid usually acts as an oxidizing agent because it decomposes to give nascent oxygen: 2HNO_3 2NO_2 + H_2O + [O].
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Solution and Explanation

(a) Acid Name: The acid used is Concentrated Nitric Acid (HNO_3). Concentrated nitric acid is a powerful oxidizing agent that oxidizes non-metals like carbon to their respective oxides or oxyacids.
(b) Balanced Equation: [ C + 4HNO_3 (textconc.) CO_2 + 2H_2O + 4NO_2 ]
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