WHEN COPPER CARBONATE REACTS WITH HYDROCHLORIC ACID, ACCORDING TO ME THE PRODUCTS WILL BE COPPER CHLORIDE AND HYDROGEN CARBONATE.

CUCO3+HCL=CUCL+HCO3

BUT IT THE TEXTBOOKK ITS WRITTEN THAT THE PRODUCTS OF THIS REACTION IS COPPER CHLORIDE, CARBON DIOXIDE AND WATER. HOW IS THIS POSSIBLE

The actual reaction is what you have studied in the book.
CuCO3 + 2HCl  ---> CO2 +  CuCl2 + H2O

The product you expecting can not be formed because whenever a carbonate reacts with acid , it forms salt water and carbon dioxide gas as the only product.This occurs because the expected product that is H2CO3 decomposes to give CO2 and H2O.
H2CO3(aq) ---> H2O + CO2

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