Question

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

List-I

A. Hardness
B. Nitrate concentration
C. Iron concentration
D. Fluoride concentration

List-II

1. 0.1 mg/L
2. 0.5 mg/L
3. 200 mg/L
4. 45 mg/L

• A. A-3, B-4, C-2, D-1
• B. A-3, B-4, C-1, D-2
• C. A-4, B-3, C-2, D-1
• D. A-4, B-3, C-1, D-2

Answer 1

The correct option is B A-3, B-4, C-1, D-2

(b) Small concentrations (approximately 1.0 mg/L) of fluoride are helpful to prevent dental cavities in children. Iron concentrations of 0.3 mg/L may cause colour problem. The Indian standard have desirable limits of 0.3 mg/L for iron and 1.5 mg/L for fluoride. Nitrate concentrations above 45 mg/L may cause blue baby disease.