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Which of the following metals will liberate hydrogen from dilute acids : Na, Fe, Pb, Cu, Hg ? Give reasons.

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The metals which occur above hydrogen in the activity series liberate hydrogen from dilute acids. Since Na, Fe and Pb occur above hydrogen in the activity series, they will liberate hydrogen from dilute acids. Cu and Hg occur below hydrogen in the activity series and hence they will not liberate hydrogen from dilute acids.

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