In the procedure of sublimation, the inverted funnel in plugged with cotton, because __________.
A
cotton stops external air to enter in funnel
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B
cotton helps in sublimation
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C
ammonium chloride is a evaporating substance, which directly evaporate on heating without converting into liquid phase.
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D
all of these
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Solution
The correct option is B ammonium chloride is a evaporating substance, which directly evaporate on heating without converting into liquid phase. During separation procedure of ammonium chloride from salt by evaporation an inverted funnel is used which is plugged with cotton boll, so that ammonium chloride do not evaporate.