NAME THE TECHNIQUES THAT WOULD YOU EMPLOY TO SEPERATE THE FOLLOWING FROM THE MIXTURE. (a) IRON FILLINGS AND POWDERED SULPHAR . (b) AMMONIUM CHLORIDE AND SODIUM CHLORIDE . (c) ETHYL ALCOHOL AND WATER . (d) NITROGEN AND OXYGEN FROM AIR . (e) SODIUM CHLORIDE
Answers
Answer:(a) by magnetism, (b) by the process of sublimation, (c) by using seperating funnel, (d) by the process of fractional distillation
Explanation: (A) Iron filling and Powdered sulphur: We can seperate them by the process of magnetism as the iron fillings get attracted to the magnet and sulphur does not.
(B) Ammonium chloride and Sodium chloride: We can seperate them by the process of sublimation as ammonium chloride sublimes and sodium chloride does not.
(C) Ethyl alcohol and Water: We can seperate them by using a seperating funnel as both of the liquids are immiscible, having different densities.
(D) Nitrogen and Oxygen: We can seperate them by the process of fractional distillation as Air is filtered to remove dust, and then cooled in stages until it reaches –200°C. At this temperature it is a liquid. The air has been liquefied.
Here's what happens as the air liquefies:
water vapour condenses, and is removed using absorbent filters.
oxygen liquefies at -183°C
nitrogen liquefies at -196°C
The liquid nitrogen and oxygen are then separated by fractional distillation.
The liquefied air is passed into the bottom of a fractionating column. Just as in the columns used to separate oil fractions, the column is warmer at the bottom than it is at the top. Thus, we can seperate oxygen and nitrogen
.