Latha took some quantity of powder of a substance in a test tube. Heat

1.	Latha took some quantity of powder of a substance in a test tube. Heated it with spirit lamp. A gas was liberated. She sent the gas into another test tube. The colour of solution in the second test tube turned into milk white. Answer the following questions : a) Which substance was heated? b) Which gas was liberated? c) What was the solution taken in second test tube? d) Which type of chemical reactions involved the experiment?
Answer» a) The substance is calcium carbonate. b) The gas liberated is carbon dioxide. c) The solution taken in the second test tube was solution of slaked lime. d) Two types of reactions took place in this experiment, i.e. decomposition and double displacement. CaCO_3(s) → CaO_(s) . CO₂ ↑ Ca(OH)_2(aq) + CO_2(g) → CaCO_3(s) + H₂O

Latha took some quantity of powder of a substance in a test tube. Heated it with spirit lamp. A gas was liberated. She sent the gas into another test tube. The colour of solution in the second test tube turned into milk white. Answer the following questions : a) Which substance was heated? b) Which gas was liberated? c) What was the solution taken in second test tube? d) Which type of chemical reactions involved the experiment?

Answer»

a) The substance is calcium carbonate.

b) The gas liberated is carbon dioxide.

c) The solution taken in the second test tube was solution of slaked lime.

d) Two types of reactions took place in this experiment, i.e. decomposition and double displacement.

CaCO_3(s) → CaO_(s) . CO₂ ↑

Ca(OH)_2(aq) + CO_2(g) → CaCO_3(s) + H₂O

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