On the basis of the position in the electrochemical series, the metal which displaces hydrogen from water and acids is :
A
Hg
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B
Al
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C
Cu
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D
Ag
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Solution
The correct option is BAl Only Al is below H+ in electrochemical series, ∴ only Al can displace H+ from acids and water in presence of Al salts 2e−+2H+→H2 [at anode]