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Question
When an element ‘X’ reacts with water, it starts floating. Identify the element ‘X’:
Options
Potassium
Calcium
Sodium
Iron
MCQ
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Solution
Calcium
Explanation:
Calcium reacts less violently with water. The reaction produces hydrogen gas. The bubbles of H2 gas stick to the surface of the metal pieces, making them buoyant and causing the metal to float.
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