Question

26. Give scientific reason : Hydrogen gas is not evolved when copper reacts with dilute H2so4
27. An atom has electronic configuration 2,8,7,
(A) What is the atomic number of this element?
(B) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.)
N(7), F(9), P(15), Ar (18)
28. Group 17 Answer the following questions based on depiction of Group 17 of modern periodic table:
(A) State whether A is a metal or non-metal. (B) State whether A is more reactive or less reactive then C.​

Answer 1

Answer:

Explanation:

This is because copper is a less reactive metal as compared to hydrogen. ... Hence addition of copper to hydrochloric acid does not give any reaction and hydrogen stays intact providing us the reason for no gas evolution during the process.