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Q.

When exposed to water, the following metals float:

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a

Magnesium and Calcium

b

Sodium and Calcium

c

Sulphur and sodium

d

Manganese and Sodium

answer is D.

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Detailed Solution

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Because of the hydrogen gas bubbles that are created attached to the surface of the metal, calcium begins to float. 

Cold water has no effect on magnesium. Magnesium hydroxide and hydrogen are produced during the reaction with hot water. The hydrogen gas bubbles that have stuck to its surface also cause it to begin floating.

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