Question

why cu not react with hcl and dil h2so4 but react with curd or acidic foods​

Answer 1

Answer:

As copper is less reactive than hydrogen hence cannot displace hydrogen in dilute hydrochloric acid or dilute sulphuric acids (non-oxidizing acids). But concentrated sulphuric acid itself is an oxidizing agent, hence it gives Redox reaction with copper, here Cu is oxidized to Cu2+ and SO42- is reduced to SO2.

Explanation:

As copper is less reactive than hydrogen hence cannot displace hydrogen in dilute hydrochloric acid or dilute sulphuric acids (non-oxidizing acids). But concentrated sulphuric acid itself is an oxidizing agent, hence it gives Redox reaction with copper, here Cu is oxidized to Cu2+ and SO42- is reduced to SO2.

Answer 2

Answer:

Cu is metal, it doesn't react with dil. H2SO4 because Cu is less reactive than H, so it cannot displace it.

Similarly it goes for HCL also. Copper is less reactive than hydrogen and hence cannot displace it from the acidic solution.