From the given pairs, name the metals which do not liberate hydrogen gas when reacted with the dilute acids.

Zn and Cr

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Cu and Hg

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Zn and Cu

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Hg and Zn

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Solution

The correct option is B Cu and Hg
In the reactivity series, metals are placed in the decreasing order of their reactivity from the top to bottom.Metals placed above the hydrogen such as Zn and Cr reacts with dilute acids and liberate hydrogen gas whereas metals placed below hydrogen such as Hg and Cu do not react with dilute acids.Hence, Cu and Hg do not liberate hydrogen gas when reacted with dilute acids.

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