Common salt also known as sodium chloride is classified as:

an element

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a compound

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a mixture

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a molecule

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Solution

The correct option is B a compound
Compounds are pure substances formed by chemical combination of two or more elements in a definite proportion by mass. Sodium chloride (common salt) is a compound made up of chlorine and sodium. The two elements present in salt can be separated only by electrolysis that is chemical decomposition produced by passing an electric current through a liquid or solution containing charged particles or ions.

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