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CBSE Class 10 Answered

when HCL is added to marble chips a gasA is evolved on passing A through lime water a white precipitate of B is formed when excess of A is passed B disolved due to formation of soluble C .  Identify A B C .  Explain the reactions.
also what is common between Bases and metal oxides . Justify your answer .
Asked by Rida Mukadam | 02 Jul, 2014, 05:37: PM
answered-by-expert Expert Answer

Marble chips are made up of CaCO3. When marble chips are dissolved in HCl, CO2 gas is evolved. Hence A is CO2. When this gas is passed through lime water, it forms CaCO3 which is a white precipitate. Hence B is CaCO3

When carbon dioxide is passed through lime water, a white precipitate of calcium carbonate is formed.

If excess CO2 is added, the following reaction takes place:

CaCO3 + H2O + CO2 → Ca (HCO3)2

The product formed Ca (HCO3)2 is colorless and is soluble in the solution. Hence C is Ca (HCO3)2.

Answered by Prachi Sawant | 03 Jul, 2014, 10:42: AM

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