Chlorides are estimated by titration with a standard silver nitrate solution by using _______ as an indicator.
a) Potassium manganate
b) Potassium chloride
c) Potassium chromate
d) Potassium dichromate
Q.2.
Carbonate hardness can be removed by adding lime to water.
a) True
b) False
Q.3.
Which of the following statement is wrong regarding permanent hardness?
a) It is also called carbonate hardness
b) It is due to the presence of sulfates, chlorides and nitrates of calcium and magnesium
c) It cannot be removed by boiling
d) It requires special methods of water softening to get removed
Q.4.
One degree of hardness is equivalent to ___ ppm.
a) 2
b) 1
c) 10
d) 100
Q.5.
What can be filled in place of the question mark in the following table?
a) Excessive hard water
b) Reasonably soft water
c) Very hard water
d) Hard water
Q.6.
In which method of determining total hardness of water is based on the premise that hardness producing substance react with soap and form insoluble compounds before lather is produced?
a) Clark’s method
b) Hehner’s method
c) Versenate method
d) EDTA method
Q.7.
What is the indicator used in EDTA method?
a) Potassium chromate
b) Potassium dichromate
c) Potassium chloride
d) Erio chrome, black T
Q.8.
The permissible limit of pH preferred for potable water is ___ ppm.
a) 6.5-9
b) 7-8.5
c) 10-14
d) 0-7
Q.9.
Given list 1 and listfind which of the following pair is correctly matched?
a) A-5
b) B-3
c) C-4
d) D-2
Q.10.
What is the concentration of H+ ions in moles/L in water if the pOH value is 6?
a) 10-6
b) 10-7
c) 10-8
d) 10-9
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