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Q.

What is the reaction when sodium and potassium react with cold water?

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a

Thermal reaction

b

No reaction takes place

c

Exothermic reaction

d

Endothermic reaction

answer is B.

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Detailed Solution

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Metals like potassium and sodium react violently with cold water. The hydrogen gas released during this reaction catches fire because of the heat released during this reaction.

Therefore the reaction between sodium or potassium with water is exothermic.

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