Seal able enclosures containing desiccants used to protect chemicals which are hygroscopic or which react with water from humidity.

• A. Mortar And Pestle
• B. Desiccator
• C. Evaporating Dish
• D. Separatory Funnel

Answer: (B)

This item tests understanding of a desiccator—a sealed enclosure that holds desiccants to keep contents dry by absorbing moisture from the air. Desiccants like silica gel or calcium chloride sit inside and create a very dry atmosphere, protecting hygroscopic chemicals or those that react with water from humidity. The lid forms a tight seal to minimize moisture exchange, and some desiccators have a stopcock to remove air or create a slight vacuum for better drying.

Mortar and pestle are used for grinding solids, not for moisture control. An evaporating dish is used to evaporate liquids or dry small samples with heating. A separatory funnel is used for separating immiscible liquids in liquid-liquid extractions. So, the desiccator is the correct choice because it specifically provides a dry, sealed environment to protect moisture-sensitive substances.