Question

Zinc metal displaces hydrogen from hydrochloric acid because zinc metal is (a)
less electropositive than hydrogen
(b) more electropositive than hydrogen
(c) as much electropositive as hydrogen
(d) none of these

Answer 1

Answer:

In displacement reaction, more reactive metal displaces less reactive metal. Since, zinc is more reactive than hydrogen it displaces hydrogen in dilute hydrochloric acid and copper is less reactive than hydrogen and hence cannot displace hydrogen in dilute hydrochloric acid.