WorksheetsDay 70-Dec 4-worksheet-Btech-Chemical quality of water
Total questions: 15
Worksheet time: 10mins
Total Dissolved Solids (TDS) in water typically range between:
100–300 ppm
500–2000 ppm
50–150 ppm
2500–3000 ppm
Suspended solids in water are most accurately measured using:
Colorimetric method
Gravimetric filtration
Magnetic separation
Gas chromatography
The drinking water pH limit prescribed is:
4.5–5.5
5.5–6.5
6.5–8.5
8.5–10.5
Mineral acidity lies in the pH range:
0–4.3
4.3–8.3
8.3–10
>10
Temporary hardness of water is removed by:
Ion exchange
Zeolite process
Boiling
Aeration
Nitrates in drinking water exceeding 45 mg/L cause which disease?
Polio
Gastroenteritis
Mottled teeth
Blue baby syndrome (Methemoglobinemia)
Potassium thiocyanate is used in water analysis to detect:
Chlorides
Manganese
Iron
Fluorides
True/False: Carbonate and hydroxyl alkalinity can occur together in water.
True
False
True/False: Hydroxyl and bicarbonate alkalinity can exist simultaneously in natural water.
True
False
Assertion (A): Permanent hardness is caused by sulphates, chlorides and nitrates of Ca & Mg. Reason (R): These salts cannot be removed by boiling.
Both A and R true, R explains A
Both true but R doesn’t explain
A true, R false
A false, R true
The relation between pH and pOH is pH + pOH = (a) .
Total alkalinity is expressed in terms of equivalent weight of (a) .
British scale expresses 1 ppm hardness as (a) ppm of CaCO3.
Dissolved solids are determined by the (a) method at 105–110°C.
Chloride concentration in treated drinking water should not exceed (a) ppm.
