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Q.

Potassium and _________ react violently with cold water. 

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a

Silver

b

Gold

c

Sodium

d

Copper

answer is D.

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Detailed Solution

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Metals like potassium and sodium are very reactive. They are so reactive that they react violently with cold water and the evolved hydrogen immediately catches fire.

Copper, gold and silver do not react with water.

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Potassium and _________ react violently with cold water.