What happens when calcium metal is treated with water?

It does not react with water

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It reacts violently with water

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Bubbles of oxygen gas formed sticks to the surface of calcium

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Bubbles of hydrogen gas formed sticks to the surface of calcium

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Solution

The correct option is D
Bubbles of hydrogen gas formed sticks to the surface of calcium

Calcium reacts with water to give calcium hydroxide and hydrogen gas. Though the reaction is exothermic, the heat evolved is not sufficient for the hydrogen to catch fire. Hence, the reaction of calcium with water is not violent. The reaction occurs as follows:
$Ca(s) + 2 H_{2} O(l) \to {Ca(OH)}_{2} (aq) + H_{2} (g)$
Calcium starts floating because the bubbles of hydrogen gas formed during the reaction stick to its surface and lifts it up.

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(i) It does not react with water
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Question 6
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(i) It does not react with water.
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(iii) It reacts less violently with water.
(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.

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___

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