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Q.

Calcium carbonate is insoluble in water. Still the water in the area where there are lime stone deposits become hard water because

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a

Lime stone dissolves in rain water due to its acidic nature

b

Lime stone dissolves in rain water due to the presence of CO2

c

Lime stone dissolves in water due to the reaction with other salts present in water

d

Lime stone dissolves in water due to pollution of sewage water

answer is B.

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Detailed Solution

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CaCO3  dissolve in rain water containing CO2  due to formation of  Ca(HCO3)2 

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