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Question

Which of the following reacts vigorously with cold water?



A

Sodium (Na)

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B

Calcium (Ca)

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C

Aluminium (Al)

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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 forming respective hydroxides and hydrogen gas. The reaction is very violent and exothermic. The evolved hydrogen immediately catches fire.
 2Na+H2O2NaOH+H2


Chemistry

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