Metals which liberate hydrogen on treatment with acids must be:
more electronegative than hydrogen
less electropositive than hydrogen
more electropositive than hydrogen
higher compound
A
less electropositive than hydrogen
B
higher compound
C
more electropositive than hydrogen
D
more electronegative than hydrogen
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Solution
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Let us consider a general reaction of a metal with an acid.
2M+2HA⟶2MA+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 H−A 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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