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Which compound gets precipitated in the detection of carbon and hydrogen?

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in Chemistry – Class 11 by (148k points)
Which compound gets precipitated in the detection of carbon and hydrogen?

(a) Copper

(b) Carbon dioxide

(c) Calcium carbonate

(d) Copper sulphate

The question was posed to me in exam.

My query is from Qualitative Analysis of Organic Compounds in chapter Organic Chemistry – Basic Principles and Technique of Chemistry – Class 11

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Right option is (c) Calcium carbonate

The best explanation: Calcium carbonate (CaCO3) gets precipitated during the detection of carbon and hydrogen. Firstly carbon will react with copper (II) oxide to form copper and carbon dioxide. Then, hydrogen will react with the same copper (II) oxide to form copper and water. After this, the presence of carbon dioxide is tested by reacting it with calcium hydroxide and the product obtained is calcium carbonate, which gets precipitated and water.

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