Question

A white solid “A” when reacts with an acid “B” in its dilute solution produces a gas which turns lime water milky. Identify “A” and “B”, and write the two equations involved

Answer 1

the white solid is: CaCO₃

the acid B is: HCl

CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

Ca(OH)₂ + CO₂ → CaCO₃ + H₂O

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Answer 2

Answer:

A=calcium carbonate

B=Hydrochloric acid (or any other acid)

Explanation:

CaCO3 + HCl = CaCl2 +CO2 +H2O

(A). + (B). =. (gas)

Here Carbon dioxide is the gas which turns limewater milky as follows..

Ca(OH)2 +CO2 =CaCO3 +H2O

(limewater)+ (gas)= milky appearance

Done!