Correct option is A
The correct answer is (a) Sodium
Explanation:
Sodium reacts vigorously with cold water at room (normal) temperature.
It forms sodium hydroxide (NaOH) and releases hydrogen gas, often with enough heat to ignite the hydrogen.
Mercury: Does not react with water.
Aluminium: Protected by a strong oxide layer; does not react with water at normal temperature.
Magnesium: Reacts very slowly with cold water; reaction is not significant at normal temperature.
Additional Information:
Alkali metals like Lithium, Sodium, Potassium react quickly with water.
Sodium is stored in kerosene to prevent accidental reaction with moisture.
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