Table salt gets moist during the rainy season because
(1) sodium chloride is hygroscopic
(2) sodium chloride is deliquescent
(3) sodium chloride contains some quantity of sodium iodide
(4) sodium chloride contains hygroscopic impurities like magnesium chloride
Answer: (4) Table salt is refined salt, which contains about 97 to 99 percent sodium chloride. It usually contains substances that make it free-flowing (anticaking agents), such as sodium aluminosilicate or magnesium carbonate. Because of the hygroscopic nature of salt, it becomes wet in the rainy season as the salt absorbs moisture from the environment.
