Question 8

Which of the following is a part of inorganic impurities of the sewage?
(a) Pesticides
(b) Urea
(c) Phosphates
(d) Vegetable waste

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Solution

The answer is option (c).

Phosphate is an inorganic impurity of the sewage. Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. The organic impurities include human faeces, animal waste, oil, urea (urine), pesticides, herbicides, fruit and vegetable waste. The inorganic impurities include nitrates, phosphates and metals.

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Match the items of Column I with the items of Column II with reference to sewage.

$\begin{matrix} C o l u m n I & C o l u m n I I (a) I n o r g a n i c i m p u r i t i e s & (i) p h o s p h o r u s a n d n i t r o g e n (b) O r g a n i c i m p u r i t i e s & (i i) n i t r a t e s a n d p h o s p h a t e s (c) N u t r i e n t s & (i i i) c h o l e r a a n d t y p h o i d (d) B a c t e r i a & (i v) p e s t i c i d e s a n d h e r b i c i d e s \end{matrix}$

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Sewage

Standard VII Chemistry

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Question 8 Which of the following is a part of inorganic impurities of the sewage? (a) Pesticides (b) Urea (c) Phosphates (d) Vegetable waste

Question 8

Which of the following is a part of inorganic impurities of the sewage?
(a) Pesticides
(b) Urea
(c) Phosphates
(d) Vegetable waste