Table salt gets moist during rainy season because A. Sodium chloride is hygroscopic B. Sodium chloride is deliquescent C. Sodium chloride contains some quantity of sodium iodide D. Sodium chloride contains hygroscopic impurities like magnesium chloride

The correct answer is: D. Sodium chloride contains hygroscopic impurities like magnesium chloride.

Sodium chloride is a non-hygroscopic substance, meaning that it does not absorb water from the air. However, table salt

can become moist during rainy season if it contains hygroscopic impurities, such as magnesium chloride. Hygroscopic impurities are substances that have a strong affinity for water and will absorb water from the air, even when the relative humidity is low. When table salt contains hygroscopic impurities, these impurities will absorb water from the air and cause the table salt to become moist.

Here is a brief explanation of each option:

• A. Sodium chloride is hygroscopic. This is incorrect. Sodium chloride is a non-hygroscopic substance.
• B. Sodium chloride is deliquescent. This is incorrect. Sodium chloride is not deliquescent. Deliquescent substances are substances that absorb water from the air until they dissolve in the water they have absorbed. Sodium chloride does not dissolve in the water it absorbs, so it is not deliquescent.
• C. Sodium chloride contains some quantity of sodium iodide. This is incorrect. Sodium chloride does not contain any sodium iodide. Sodium iodide is a different substance that is used in some applications, such as photography.
• D. Sodium chloride contains hygroscopic impurities like magnesium chloride. This is correct. Sodium chloride can contain hygroscopic impurities, such as magnesium chloride. Hygroscopic impurities are substances that have a strong affinity for water and will absorb water from the air, even when the relative humidity is low. When table salt contains hygroscopic impurities, these impurities will absorb water from the air and cause the table salt to become moist.