I. Sewage water treatment plants are setup for controlling water pollution.
II. BOD level increases after sewage treatment.

I and II are true

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I and II are false

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I is true and II is false

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I is false and II is true

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Solution

The correct option is C I is true and II is false
Sewage treatment constitutes of 3 stages primary, secondary and tertiary. BOD i.e biological oxygen demand decreases during secondary stage. This makes water permissible to let into natural water resources.

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Similar questions

	I		II
(a)	BOD	(i)	Treatment of sewage
(b)	KVIC	(ii)	Measure of organic matter in water
(c)	LAB	(iii)	Biological methods for controlling plant diseases
(d)	STPS	(iv)	Increases vitamin B $_{12}$
		(v)	Production of biogas

Statement - I: $C l^{-} a n d C a^{2 +}$ are isoelectronic species.
Statement - II: Isoelectronic species should have same charges.

2 \times 2

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