Question

Match List-I (parameters) with List-II (Permissible concentrations in drinking water) and select the correct answer using the codes given below the lists:

List I

(a) Hardness

(b) Chlorides

(c) Iron 

(d) Fluoride

List II

(i) 1 mg/l 

(ii) 200 mg/l 

(iii) 250 mg/l

iv) 0.1 mg/l 

1. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
2. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
3. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
4. (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

Answer 1

Correct Answer - Option 2 : (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

Explanation:

The permissible limits of various compounds are as follows:

Parameters	Requirement (Acceptable Limit)	Permissible Limit in the Absence of Alternate Source
Alkalinity	200	600
pH	7 - 8.5	<6.5 & > 9.2
Hardness (mg/L)	200	600
Chloride content (mg/L)	250	1000
Free ammonia (mg/L)	0.15	0.15
Organic ammonia (mg/L)	0.3	0.3
Nitrite (mg/L)	0	0
Nitrate (mg/L)	45	45
Fluoride content (mg/L)	1	1.5
Iron as Fe (mg/L)	0.1	1.0
Sulphate (mg/L)	200	400
Calcium (mg/L)	75	200