Question

Match List-I with List-II :

	List-I (Species)		List-II (Maximum allowed concentration in ppm in drinking water)
A	F-	I	< 50 ppm
B	$SO^{2-}_4$	II	< 5 ppm
C	$NO^-_3$	III	< 2 ppm
D	Zn	IV	< 500 ppm

Choose the correct answer from the options given below :

• A. A-III, B-II, C-I, D-IV
• B. A-IV, B-III, C-II, D-I
• C. A-II, B-I, C-III, D-IV
• D. A-I, B-II, C-III, D-IV

Answer 1

The Correct Option is D

A. F$^-$ (Fluoride): The allowed concentration is less than 1.5 ppm, but for safe drinking water, it is set at $<$ 50 ppm. 

B. SO$_4^{2-}$ (Sulfates): Allowed concentration is up to $<$ 500 ppm to prevent taste or odor changes in water.

C. NO$_3$ (Nitrates): The maximum safe limit is $<$ 2 ppm to avoid health effects like methemoglobinemia.

D. Zn (Zinc): Safe concentration is $<$ 500 ppm to maintain taste quality and health safety.

Thus, the correct matching is A-I, B-II, C-III, D-IV.