Class 7 Science MCQs e-Book PDF | Importance of Water App Download
Class 7 Science Competitive Exam: Practice Test 13 (Chapter 13)
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In sewage treatment plants, large material is removed by
Desalination plants are used to convert
The population which does not have tap water in their homes, is
Water can be kept clean by detergents, if they are
'Distillation' can also be used to treat
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