Question

Dash reacts with cold water vigorosly

Answer 1

Alkali metals react with cold water vigorously as they have only one electron to lose to form an octet and are also very reactive in nature being in group 1.

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Answer 2

Answer:

First group elements are very reactive and they won't want to exist, so they immediately catches fire when exposed to atmosphere. They shows a vigorous reaction even with water and turns into their respective hydroxides with the evolution of heat.

Sodium, potassium are some elements in the first group.

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Explanation: