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Preparation of Hydrogen from Cold Water and Metals

Which of the ...

Question

Which of the following metal on reaction with cold water liberates hydrogen gas but does not float on water?

A

Sodium (Na)

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B

Calcium (Ca)

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C

Gold (Au)

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D

Zinc (Zn)

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Solution

The correct option is A
Sodium (Na)

Metals such as potassium and sodium react violently with cold water. The reaction is so violent and exothermic that the evolved hydrogen immediately catches fire.

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