Which of the following metals do not liberate hydrogen to form dilute acids?

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Iron

Tin

Copper

Aluminium

answer is A.

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Detailed Solution

Copper does not liberate hydrogen to form dilute acids.
Copper will not liberate hydrogen gas to form dilute acids because metals more reactive than hydrogen can replace hydrogen. Tin can replace hydrogen to liberate hydrogen gas because it is more reactive. Iron and aluminium are more reactive than hydrogen in the activity series. So they will liberate hydrogen gas.

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