Class 10 Chemistry MCQs – Practice Test 9 (Chapter 7)

Environmental Chemistry II Water MCQs with Answers PDF Download – Test 9

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Environmental Chemistry II Water MCQs – Practice Test 9 PDF Download

MCQ 41: The third step of sewage water treatment is called:

primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination

MCQ 42: Water that gives little lather is called:

hard water
soft water
dirty water
clean water

MCQ 43: Water exists in how many different states on Earth?

one
two
three
four

MCQ 44: What is the percentage of water from oceans?

0
0.002
0.006
0.97

MCQ 45: The hardness which can be removed by boiling is called:

permanent hardness
temporary hardness
stiffness
toughness

Class 10 Chemistry MCQs App & e-Book – Environmental Chemistry II Water Study Guide

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