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Question

Which of the following metals float in their reactions with cold water?

A
Gold (Au)
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B
Zinc (Zn)
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C
Iron (Fe)
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D
Calcium (Ca)
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Solution

The correct option is D Calcium (Ca)
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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