Question

With reference to Drinking Water Quality, match the Pollutants (List-I) with their Permissible Limits in the Absence of Alternate sources (List-II)

List-I		List-II
No.	Pollutant	No.	Limits
(i)	Chloride (as Cl)	(iv)	1000 mg/lit
(ii)	Sulphate (as SO4)	(v)	400 mg/lit
(iii)	Total Alkalinity as CaCO3	(vi)	600 mg/lit

1. (i)-(iv), (ii)-(v), (iii)-(vi)
2. (i)-(iv), (ii)-(vi), (iii)-(v)
3. (i)-(vi), (ii)-(v), (iii)-(iv)
4. (i)-(v), (ii)-(iv), (iii)-(vi)

Answer 1

Correct Answer - Option 1 : (i)-(iv), (ii)-(v), (iii)-(vi)

Explanation:

The permissible limits of various compounds are as follows:

Parameters	Requirement (Acceptable Limit)	Permissible Limit in the Absence of Alternate Source
Total suspended solids	500	2000
Turbidity (NTU)	1	10
Colour (TCU)	5	25
Taste & odour (TON)	1	3
Total dissolved solids (mg)	500	2000
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