Q31 of 270 Page 68

(a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved.

Write equations of the reactions involved.

Acids give carbon dioxide gas and respective salts along with water when they react with metal carbonates.

Metal carbonate + Acid ⇨ Salt + Carbon dioxide + Water Example-Hydrochloric acid gives carbon dioxide gas, sodium chloride along with water when reacts with sodium carbonate.


Na2CO3 + 2HCl ⇨ 2NaCl + CO2 + H2O



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30 Why does an aqueous solution of an acid conduct electricity? 30 Why does distilled water not conduct electricity whereas rain water does? 31 What happens when carbon dioxide gas is passed through lime water:

(i) for a short time?


(ii) for a considerable time?


Write equations of the reactions involved.

 32 With the help of labeled diagrams, describes an activity to show that acids produce ions only in aqueous solutions.