Limestone powder disappears by adding dilute hydrochloric acids.
Write the word equation for this chemical change.

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Solution

The chemical name of limestone is calcium carbonate.
So the word equation will be.

Calcium carbonate+ hydrochloric acid → calcium chloride+ carbon dioxide+ water.

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On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained.

(a) Write a balanced chemical equation of the reaction involved.

(b) What other name can be given to this precipitation reaction?

(a) What happens when dilute hydrochloric acid is added to sodium carbonate ? Write a balanced chemical equation of the reaction involved.

(b) Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate ? How will you test for the presence of this gas ?

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