Question : Which of the following metals reacts violently with cold water?
Option 1: Magnesium
Option 2: Aluminium
Option 3: Zinc
Option 4: Potassium
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Correct Answer: Potassium
Solution : The correct option is potassium .
Potassium (K) reacts violently with cold water. When potassium comes into contact with water, it undergoes a highly exothermic reaction, producing hydrogen gas and forming a solution of potassium hydroxide. This reaction is more pronounced with alkali metals like potassium compared to alkaline earth metals like magnesium (Mg).
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