pH meter gives an electrical response proportional to the concentration of hydrogen ion. To convert this response into pH, glass electrode must be calibrated against standard solution of known H+ concentration. Which of the following standard solution(s) is/are likely to be used.
 pH 4.0 buffer
 pH 7.0 buffer
 pH 10 buffer
 All of the above.

After each single measurement, the probe is rinsed with ____________ to remove any trace of the solution being measured.
I. Ionized water
II. Distilled water
III. Deionized water

 I only.
 I and II only.
 II and III only.
 None of the above.

Permissible limit of alkalinity in drinking water is
a : 50mg/l
b : 300mg/l
c : 20-200mg/l
d : 100mg/l

Alkalinity in waste water is useful because it provides buffering to resist changes in pH value.
a : True
b : False

Alkalinity can also be related to hardness because of presence of
a : CaCO₃
b : MgCO₃
c : Na₂CO₃
d : K₂CO₃

Alkalinity is important in aquatic life because
a : It helps water to remain warm
b : It helps water to remain cold
c : It buffers against rapid pH change
d : None of the above

An alkalinity test measures the level of
a : Carbonates only
b : Hydroxides only
c : Bicarbonates, carbonates, and hydroxides
d : None of the above

Higher is the alkalinity in water easier it is for pH change.
a : False
b : True

Excessive alkalinity level in human body can
a : Expel the unwanted pathogens in the bloodstream
b : Cause skin irritations
c : Lead to gastrointestinal issues
d : All of the above

Data obtained from alkalinity is used for following engineering practices.
a : Chemical coagulation of water and waste water
b : Water softening
c : Corrosion control
d : All of the above

Majority of mineral water supplied is mostly
a : Acidic
b : Neutral
c : Alkaline
d : None of the above