Question

Egg shells are dropped into hcl acid.What is balanced chemical equation.

Answer 1

Egg shells are calcium carbonate ( CaCO3 ).  The reaction with HCl is as follows:
 
         CaCO3 + 2HCl ------------->  CaCl2 +CO2 + H2O
           (s)            (aq)                       (aq)     (g)        (l)
                                                                                                               

Answer 2

Egg shells contain calcium carbonate(caco3).
So the reaction is --
CaCo3+2HCl -----> CaCl2 + H2O+ CO2

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