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Question

Metals which liberate hydrogen on treatment with acids must be:

A
more electronegative than hydrogen
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B
less electropositive than hydrogen
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C
higher compound
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D
more electropositive than hydrogen
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Solution

The correct option is C more electropositive than hydrogen
Let us consider a general reaction of a metal with an acid.
2M+2HA2MA+H2

To displace A ion from HA, the metal M should be more electropositive than H+ so that it can form more stable oxide. If the metal is less electropositive, it would not be able to displace A ion from HA because the HA bond will be strong due to more difference between the electronegativity of H and A.

Thus the answer is option (D) more electropositive than hydrogen.

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