Question

why does not copper liberate hydrogen on reacting with dilute sulphuric acid

Answer 1

because copper is below hydrogen in electrochemical series where as other metals are above hydrogen hence they can reduce hydrogen ion present in acid to hydrogen gas

Answer 2

Answer: Because copper is less reactive than hydrogen

Explanation: A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.

But copper being less reactive, can not easily lose electrons as compared to hydrogen as it lies below hydrogen in the electrochemical series and do not result in liberation of hydrogen from dilute sulphuric acid.

$Cu+H_2SO_4\rightarrow no reaction$