Correct the statement : Calcium metal catches fire when dropped in a trough of water

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Solution

Calcium metal does not catches fire when dropped in a trough of water.
Actually, when calcium reacts with water, the reaction is less vigorous and it forms calcium oxide with release of hydrogen gas, but the heat evolved is not sufficient for hydrogen gas to catch fire and so it sticks over the surface of calcium oxide and the wall of container which do not let the calcium oxide to sink and it continues to float on the water surface .

The reaction involved is :

Ca + 2H₂O --> Ca(OH)₂ + H₂

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Similar questions

Q. When sodium is dropped in small amount of water it catches fire. Which one of the following gas release in this process?

(a) Name a metal for each case:
(i) it does not react with cold as well as hot water but reacts with steam.
(ii) It does not react with any physical state of water.

(b) When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?

Which of the following metal catches fire when reacts with water?

What happens when calcium metal is treated with water?

Objects made of metal usually ____ when dropped in water.

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