Class 10 Chemistry MCQs - Chapter 7

Environmental Chemistry II Water Quiz Questions and Answers PDF - 7

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Environmental Chemistry II Water Questions & Answers PDF Download: MCQ Quiz 7

MCQ 31: Process in which water is filtered through sand and gravel is called

sedimentation
coagulation
filtration
chlorination

MCQ 32: How many basic steps are involved in raw water treatment?

three
four
five
six

MCQ 33: Natural water is

pure
impure
non distilled
distilled

MCQ 34: Addition of washing soda removes

softness of water
temporary hardness of water
permanent hardness of water
hydrogen from water

MCQ 35: The first step of sewage water treatment is called

primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination

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