Top 10 viva/interviewquestions on Chlorides content present in wastewater

Chlorides are widely distributed as salts of calcium, sodium and potassium in water and wastewater. In potable water, the salty taste produced by chloride concentrations is variable and dependent on the chemical composition of water.

The major taste producing salts in water are sodium chloride and calcium chloride. The salty taste is due to chloride anions and associated cations in water. In some water which is having only 250 mg /L of chloride may have a detectable salty taste if the cat-ion present in the water is sodium.

On the other hand, a typical salty taste may be absent even if the water is having very high chloride concentration for example 1000 mg /L. This is because the predominant cation present in the water is not sodium but either calcium or magnesium may be present.

1. The limit of chlorides in drinking water as per IS code is

a) 200 ppm
b) 225 ppm
c) 250 ppm
d) 500 ppm

2. Silver nitrate is stored in a brown bottle

a) to avoid decomposition by sun light
b) because it is dark in colour
c) because the solution is colourless
d) to avoid heat

3. The colour of Silver Chromate is

a) Milky White
b) pale Yellow
c) Colourless
d) Brick Red

4. When both hardness and chloride content are very high above 500 mg/L, then the water will be

a) Non salty in nature
b) Fit for drinking
c) Salty in nature
d) Soft water

5. Presence of chloride can corrode________.

a) GI pipes
b) Rubber tubes
c) PVC pipes
d) Glass pipes

6. The chloride concentration in sewage is

a) More concentrated than the municipal water supplied
b) Equal concentration to the municipal water supplied
c) Less concentrated than the municipal water supplied
d) Only in trace

7. Chloride consumed by human beings

a) Pass through the fecal matter as it is
b) Gets changed into other forms
c) Gets disappeared in the body
d) Stored in bones

8. Chloride gives salty taste to water particularly when present as ___.

a) Sodium chloride
b) Magnesium chloride
c) Potassium chloride
d) Zinc chloride

9. The point at which a clear visual change is observed after the reaction between titrant and titrates is called

a) End point
b) Equivalence point
c) Equal point
d) Double equivalence point

10. Most common ion in the water is

a) Fluoride
b) Nitrate
c) Chloride
d) Sulphate

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