IGCSE O Level Chemistry MCQs - Chapter 9

Methods of purification Quiz Questions and Answers PDF - 7

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Methods of purification Questions & Answers PDF Download: MCQ Quiz 7

MCQ 31: In order to lower melting point of ice,

hot water shall be poured
solar energy shall be waited for
salt can be spread over the ice
the ice shall be scrapped from the roads and doorways

MCQ 32: In the fractionating column of fractional distillation, as we go higher in the column the

temperature becomes lower
temperature becomes higher
minimum absorption is carried out
risks of sublimation exists

MCQ 33: After centrifugation when the sublimate settles, the clear liquid can be

allowed to rest
allowed to form crystals
decanted off
evaporated

MCQ 34: Pure stearic acid melts at exactly

78 °C
70 °C
below 70 °C
above 80 °C

MCQ 35: In order to separate colors, dyes and amino acids, the useful method will be

crystallization
centrifugation
filtration
chromatography

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