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 (unlike calcium) due to its vigorous reaction (with 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 ASodium (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.