Question

Match the various types of impurities present in water in Group I with the appropriate water treatment process given in Group II. 
\[\begin{array}{|c|c|} \hline \textbf{Group I} & \textbf{Group II} \\ \hline \text{P: Fine suspended matter} & \text{1: Aeration} \\ \hline \text{Q: Pathogenic bacteria} & \text{2: Plain sedimentation} \\ \hline \text{R: Color, odour and taste} & \text{3: Sedimentation with coagulation} \\ \hline \text{S: Floating matter as leaves} & \text{4: Screening} \\ \hline & \text{5: Disinfection} \\ \hline \end{array}\]

• A. P–2, Q–5, R–3, S–4
• B. P–3, Q–4, R–1, S–2
• C. P–1, Q–4, R–3, S–2
• D. P–5, Q–3, R–4, S–1

Hint:

Screening removes large particles, while coagulation is used for fine suspended solids. Always follow these basic steps in water treatment.

Answer 1

The Correct Option is D

Step 1: Understand the types of impurities.
- Fine suspended matter: This typically refers to particles that are small and cannot easily settle without coagulation. Hence, P corresponds to 5: Disinfection (typically involves removal of these particles).
- Pathogenic bacteria: These require disinfection for removal, which makes Q correspond to 5: Disinfection.
- Color, odour and taste: This impurity is typically removed using sedimentation with coagulation. Hence, R matches with 3: Sedimentation with coagulation.
- Floating matter as leaves: The simplest treatment for leaves and large particles is screening. Hence, S corresponds to 4: Screening.

Step 2: Final matching. \[ P-5, Q-3, R-4, S-1 \] This corresponds to option (D).