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Question

will float when put in a beaker containing cold water.

A
Magnesium
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B
Gold
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C
Zinc
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D
Iron
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E
Calcium
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Solution

The correct option is E Calcium
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Calcium reacts less vigorously with water to form hydrogen gas. The metal starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal.

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