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Extraction of Highly Reactive Metals

Why calcium f...

Question

Why calcium floats over water during the reaction with water

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Solution

Ca(s) + 2H₂O(l) → Ca(OH)₂(aq) + H₂(g)

The reaction of calcium with water is less violent. So, the heat released is not sufficient for the hydrogen to catch fire. Calcium starts floating because the bubbles of hydrogen gas which are formed during the reaction stick to the surface of the calcium metal and hence calcium floats on water.

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Q. Calcium floats over water during its reaction with water. Give reason.

Q. Assertion :Calcium floats over water during the reaction with water. Reason: Calcium reacts with water less vigorously so that the heat evolved is not sufficient for the hydrogen formed, to catch fire. The bubbles of hydrogen gas formed stick to the surface of the water calcium

Q. Calcium on reacting with water begins to float.

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