Question

CuCO3(s) + 2HCl(aq) → CuCl2(aq) + H2O(l) + CO2(g). Which statement correctly describes the substances in this reaction?

Answer 1

So,

All you need to do is read the physical states ( ) to determine the answer.

CuCO3 is solid.

HCl is in aqueous solution.

CuCl2 is in aqueous solution.

H2O is liquid.

CO2 is gas.

It is then easy to see that option D is true.  CuCO3 is the solid reactant, and CO2 is the gas product.