Answer:
B. CaCl₂ + H₂CO₃ → CaCO₃ + 2HC
Step-by-step explanation:
A balanced reaction has the same number of atoms in the both sides of the reaction. In the options:
A. CaCl₂ + H₂CO₃ → 2CaCO₃ + HCI
In this reaction there is 1 Ca in reactants and 2 in products -The reaction is unbalanced-
B. CaCl₂ + H₂CO₃ → CaCO₃ + 2HCl
There is 1 Ca is both sides, 2Cl, 2H, 1C and 3 Oxygens -The reaction is balanced
C. CaCl₂ + 2H₂CO₃ → CaCO₃ + HCI
There is 1 Ca in both sides but 2Cl in reactants and 1 in Cl -The reaction is unbalanced-
D. 2CaCl₂ + H₂CO₃ →CaCO₃ + HCI
There are 2 Ca in reactants and 1 in Ca -The reaction is unbalanced-