Class 10 Chemistry MCQs (Grade 10) From Textbook
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Class 10 Chemistry Competitive Exam MCQs – Practice Test 5 (Chapter 7)
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Water exists in how many states?
How many basic steps are involved in sewage water treatment?
What is the percentage of water from glaciers and ice caps?
What is the third step of raw water treatment?
Which of the following is a dangerous intestinal disease that spreads by polluted water containing bacteria?
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