Multiple choice

Group I lists estimation methods of some of the water and wastewater quality parameters. Group II lists the indicators used in the estimation methods. Match the estimation method (Group I) with the corresponding indicator (Group II).

 
Group I Group II
P. Azide modified Winkler method for dissolved oxygen 1. Eriochrome Black T
Q. Dichromate method for chemical oxygen demand 2. Ferrion
R. EDTA titrimetric method for hardness 3. Potassium chromate
S. Mohr or Argentometric method for chlorides 4. Starch

  1. P - 3, Q - 2, R - 1, S - 4

  2. P - 4, Q - 3, R - 1, S - 2

  3. P - 4, Q - 1, R - 2, S - 3

  4. P - 4, Q - 2, R - 3, S - 1
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 

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