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Apparatus: Two test tubes, bent tube, ru...

Apparatus: Two test tubes, bent tube, rubber cork, burner, etc.
Chemicals: Calcium carbonate, freshly prepared lime water.
Procedure: Take some calcium carbonate in a test tube. Fit a bent tube to this test tube with the help of a rubber cork. Insert the other end of the bent tube in the freshly prepared lime water taken in the other test tube. Heat the powdered calcium carbonate in the first test tube strongly.
What will you observe?

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Using given apparatus and chemicals, decomposition of calcium carbonate and property of evolved gas is studied. Diagram:
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