The metal which does not react with water or dilute $H_{2} S O_{4}$ but reacts with concentrated $H_{2} S O_{4}$ is ________. $(A l / C u / Z n / F e)$ .

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Solution

The metal which does not react with water or dilute $H_{2} S O_{4}$ but reacts with concentrated $H_{2} S O_{4}$ is $C u$ .
$C u + 2 H_{2} S O_{4} (conc.) \to C u S O_{4} + 2 H_{2} O + S O_{2}$

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