Question

An element 'X after reacting with acids liberates hydrogen gas and candisplace lead and mercury from their salt solutions. The metal 'X is

Answer 1

The element X is Copper.

Explanation :

Reactive metals from 3d transition series like Cu are very reactive because their standard reduction potential values are low.

Hence, when treated with a acid it tends to liberate hydrogen gas.

Also, because of  its low reduction potential value, it can easily displace lead and tin from their salt solutions.

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