Question

Choose the method to separate NaCl and NH4Cl from its mixture:

• A. Chromatography
• B. Colorimetry
• C. Centrifugation
• D. Sublimation

Answer 1

Answer:

D. Sublimation

Ammonium chloride can be sublimed whereas sodium chloride cannot be sublimed. When a mixture of sodium chloride and ammonium chloride is heated, ammonium chloride changes its state from solid to vapour. The vapours of ammonium chloride are then condensed on cold surface. Sodium chloride is left behind.