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Question

The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is ________. (Al/Cu/Zn/Fe).

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Solution

The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is Cu.
Cu+2H2SO4(conc.)CuSO4+2H2O+SO2

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