Read the following statements carefully and choose the correct options.

(i) The inorganic impurities present in wastewater are herbicides, pesticides, oil and more.
(ii) The organic impurities are phosphates, metals, nitrates, and more.
(iii) There are no germs or bacteria present in wastewater.

All the statements are incorrect.

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All the statements are correct.

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Statements (i) and (iii) are incorrect, but statement (ii) is correct.

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Statements (i) and (ii) are incorrect, but statement (iii) is correct.

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Solution

The correct option is A All the statements are incorrect.
The inorganic impurities present in sewage are nitrates and phosphates.

The organic impurities present in sewage are human faeces, animal waste (like animal dung), urea (from urine), oil, fruit and vegetable wastes, pesticides, herbicides, and more.

Wastewater streams contain many different types of pathogens that present a major health risk.

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Question 19

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

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

What is a sewerage? What are various inorganic impurities present in wastewater? [2 MARKS]

Q. Read the following statements (A-D) related to the composition of domestic wastewater and select the correct option stating true (T) and false (F).

A. Wastewater contains 0.3 % of impurities.
B. Suspended solids in wastewater include sand, silt and clay.
C. Colloidal materials like fecal matter, bacteria, cloth and paper fibres are present in wastewater.
D. Dissolved materials in waste water include nutrients like starch, nitrates and ammonia.

Q. Read the following statements carefully.

(I) Sulphide ores are converted into oxides by heating strongly in the absence of air or oxygen.

(II) Impurities such as soil, sand etc, present in ores are called gangue.

Now, choose the correct option.

Q. Match the impurities present in sewage with their types.

(i) Human faeces	(a) Inorganic
(ii) Metals	(b) Organic
(iii) Vibrio cholerae	(c) Bacteria

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Read the following statements carefully and choose the correct options. (i) The inorganic impurities present in wastewater are herbicides, pesticides, oil and more. (ii) The organic impurities are phosphates, metals, nitrates, and more. (iii) There are no germs or bacteria present in wastewater.

Read the following statements carefully and choose the correct options.

(i) The inorganic impurities present in wastewater are herbicides, pesticides, oil and more.
(ii) The organic impurities are phosphates, metals, nitrates, and more.
(iii) There are no germs or bacteria present in wastewater.