Chemistry
Iodine can be separated from a mixture of Iodine and Potassium Chloride by

Sublimation
Sedimentation
Filtration
Distillation

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Chemistry
Sodium vapour lamps glow with yellow colour. This is due to

Its ability to absorb all other colours except yellow
The low ionisation energy of sodium
The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum
sublimation of sodium to emit yellow colour

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