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Q.

The metal that cannot displace hydrogen from dilute hydrochloric acid is

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a

aluminium

b

iron

c

copper

d

zinc

answer is C.

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Detailed Solution

Electrodes having SRP values lesser than SRP of NHE can displace H2 from acid or water. orCopper cannot displace hydrogen from the reaction with dilute hydrochloric acid. The reason is  in electrochemical series copper is placed below the hydrogen. So, its electrode potential is less than the hydrogen.
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