Which of the following methods does not liberate hydrogen?

Z n + H_{2} S O_{4} (d i l .)

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M g + H_{2} S O_{4} (d i l .)

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C u + H_{2} S O_{4} (d i l .)

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Z n + H C l (d i l .)

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Solution

The correct option is B $C u + H_{2} S O_{4} (d i l .)$
$C u$ cannot be oxidized by dilute $H_{2} S O_{4}$ .
$C u$ is a weak reducing agent.
$C u$ liberates hydrogen only with conc. $H_{2} S O_{4}$ .

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