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Conductivity MP BP and Electronegativity (Group 2)

Calcium float...

Question

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

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Solution

Hydrogen gas is obtained during the reaction of calcium with water.
$C a + 2 H_{2} O \to C a (O H)_{2} + H_{2} ↑$
This hydrogen gas is adsorbed on the surface of calcium. Hence, calcium floats over water during its reaction with water.

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