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NCERT Exemplar Solutions Class 7 Science Solutions for Wastewater Story - Exercise in Chapter 18 - Wastewater Story
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What are the different types of inorganic and organic impurities generally present in sewage?
Answer:
(i) Inorganic impurities – nitrates, phosphates and metals.
(ii) Organic impurities – fruit and vegetable wastes, oil, urea, human faeces, animal waste, pesticides and
herbicides.
Video transcript
"hi guys welcome to lido q a video i am
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bringing you this question on your
screen explain why a ringing bell
suspended in a vacuum chamber chamber
cannot be heard outside
so this is because
there are
no air molecules
to vibrate
and carry the sound waves in the vacuum
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