Question

The water quality is categorized "Excellent" for irrigation when the chloride concentration (in meq L⁻¹) is

• A. Less than 4
• B. 4-7
• C. 7-12
• D. Above 12

Hint:

Chloride classification:
- Excellent: < 4 meq L⁻¹.
- Good: 4-7 meq L⁻¹.
- Permissible: 7-12 meq L⁻¹.
- Doubtful: > 12 meq L⁻¹.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question tests knowledge of irrigation water quality standards.

Step 2: Detailed Explanation:
Chloride concentration is a key parameter for irrigation water quality.
The classification for chloride (meq L⁻¹) is:
- Excellent: Less than 4 meq L⁻¹ (A).
- Good: 4-7 meq L⁻¹.
- Permissible: 7-12 meq L⁻¹.
- Doubtful: Greater than 12 meq L⁻¹.
High chloride levels can cause toxicity to plants.
Thus, "Excellent" water has chloride less than 4 meq L⁻¹.

Step 3: Final Answer:
Thus, excellent water quality has chloride concentration less than 4 meq L⁻¹, which corresponds to option (A).
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