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Question

Which of the following reacts vigorously with cold water?
  1. Calcium (Ca)
  2. Aluminium (Al)
  3. Sodium (Na)
  4. Zinc (Zn)


Solution

The correct option is C Sodium (Na)
Metals at the top of the reactivity series 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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