NCERT Exemplar Solutions Class 7 Science Solutions for Wastewater Story - Exercise in Chapter 18 - Wastewater Story

Question 19 Wastewater Story - Exercise

Which of the following is a part of inorganic impurities of the sewage?

(a) Pesticides

(b) Urea

(c) Phosphates

(d) Vegetable waste


The answer is (c) Phosphates


Pesticides, urea and vegetable waste ate the organic waste that acts as impurities in sewage water whereas phosphates are the inorganic impurities present in sewage.

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