Q31 of 270 Page 68

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.

When CO2 is passed through lime water

(i) for a short time, it turns the lime water into milky white due to the formation of calcium carbonate.



(ii) for a considerable time, the whiteness of the lime water disappears and it becomes clear again due to the formation of carbonic acid.




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30 Why does distilled water not conduct electricity whereas rain water does? 31 (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.

 32 With the help of labeled diagrams, describes an activity to show that acids produce ions only in aqueous solutions. 33 Which element is common to all acids?