Question

acid can be stored in copper utensil but not in zinc​

Answer 1

Copper is less reactive than Zinc.

When an acid is put into a zinc vessel, zinc reacts with acid, whereas when we put it in a copper vessel, it does not displace hydrogen and so it does not react with acid

Answer 2

acid can be stored in copper utensil  but not in zinc​ because acid reacts with zinc

zn+H2SO4-------⇒znso4+H2