1. Standard EDTA solution is used to determine the _____.

[A] Turbidity in water
[B] Dissolved oxygen in water
[C] Hardness in water
[D] Residual Chlorine in water

Answer: Option C

2. Which Chemical indicator turns water into pink colour if the pH is more than 8.3?

[A] Murexide
[B] Bromothymol
[C] Methyl Orange
[D] Phenolphthalein

Answer: Option D


3. Alkalinity in water is expressed as mg/L in terms of _____.

[A] Sodium Carbonate
[B] Sodium Bicarbonate
[C] Calcium Carbonate
[D] Magnesium Carbonate

Answer: Option C

4. pH of sea water varies from
[A] 7.5 to 8.4
[B] 8.2 to 9.3
[C] 6.2 to 7.1
[D] 6.5 to 7.5

Answer: Option A


5. The major portion of alkalinity in natural waters is caused by _____.

[A] Hydroxide, phosphate and Bicarbonate
[B] Silicate, ammonia and bicarbonate
[C] Hydroxide, ammonia and Bicarbonate
[D] Hydroxide carbonate and Bicarbonate

Answer: Option D


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