The metal which does not react with water or dilute sulphuric acid but reacts with concentrated sulphuric acid

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Copper does not react with dilute sulphuric acid as its reduction potential is higher than that of hydrogen. But, concentrated sulphuric acid is an oxidising agent. So, when copper is heated with conc.H2SO4, a redox reaction occurs and the acid gets reduced to sulphur dioxide.

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or zinc
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Iron and magnesium
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the answer is very tough
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