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Question
State three reasons (of which at least one must be chemical) for believing that sodium is a metal.
Solution
(i) Sodium reacts violently with water to form sodium hydroxide and hydrogen gas, which is the property of a metal.
(ii) Sodium reacts with dilute acids and displaces hydrogen gas from the acids and forms sodium salt, which is the property of a metal.
(iii) Sodium exists in solid state at room temperature, which is the property of a metal.
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