IGCSE O Level Chemistry MCQs - Chapter 9
Methods of purification Multiple Choice Questions (MCQs) PDF Download - 1
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Methods of purification MCQs with Answers PDF Download: MCQ Quiz 1
Crude oil can be fractionally distilled to produce
- diesel
- petrol
- paraffin
- all of above
What is true about mixtures?
- they have a range of boiling points
- they have a range of melting points
- they lack of exact concentrations
- all of above
Alternative techniques to crystallization involve
- decanting only
- centrifuging
- filtration
- decanting and centrifuging
Vacuum distillation is used in
- under high pressures
- under low pressures
- gentle heating
- quick heating
Which statement is true about when the hot molten liquid cools?
- first crystals are the most pure
- impure substances may also form the crystals
- it turns into gas
- it turns into aqueous solution
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