Class 10 Chemistry MCQs - Chapter 7
Environmental Chemistry II Water Multiple Choice Questions (MCQs) PDF Download - 9
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Environmental Chemistry II Water Questions & Answers PDF Download: MCQ Quiz 9
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
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