Carbon and dilute sulfuric acid

I have to distinguish between copper oxide and carbon. I thought of dilute sulfuric acid because it forms copper sulfate with copper oxide. But I don't know how carbon reacts with dilute sulfuric acid. I know how carbon reacts with *concentrated* sulfuric acid but dilute?




Sulfuric acid is unreactive with carbon- indeed only hot concentrated sulfuric acid reacts with carbon to produce carbon dioxide. 


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