Question

which one of the following pairs of substances on reaction will not evolve H2 gas?
1.copper and hcl (aq)
2.iron and steam
3.iron and H2SO4(aq)
4.sodium and ethyl alcohol
ans with explanation​

Answer 1

Explanation:

As per the electrochemical series, Copper's oxidation potential is lower than that of hydrogen, so it cannot displace hydrogen from hydrochloric acid.