Question

What is observed when a mixture of common salt and ammonium chloride is heated?

• A. Solid common salt gets deposited on the cooler parts of the funnel, while solid ammonium chloride remains in the china dish
• B. Mixture of common salt and ammonium chloride turns into greenish crystals when allowed to cool
• C. Ammonium chloride is deposited on the cooler parts of the funnel and solid common salt remains in the china dish
• D. Droplets containing both common salt and ammonium chloride appear on the upper part of the funnel, while some molten mixture of common salt and ammonium chloride remains in the china dish

Answer 1

The correct option is C Ammonium chloride is deposited on the cooler parts of the funnel and solid common salt remains in the china dish

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Ammonium chloride, camphor, anthracene, napthalene can sublime but common salt cannot sublime. Ammonium chloride evaportaes and forms vapours which rise up the funnel and get deposited in the cooler parts of the funnel. Sodium chloride remains in the china dish as no reaction takes place.