Water Hardness MCQs
__________ is the end point of the titration in the soap titration method.
(A). Â Formation of lather
(B). Â Formation of salts
(C). Â Formation of carbonates
(D). Â Formation of bicarbonates
(E). None of these
Multiple Choice Question Answer: a
All the hardness causing ions can be precipitated into their respective_____ by the sodium soap.
(A). Â Carbonates
(B). Â Bicarbonates
(C). Â Stereates
(D). Â Chlorides
(E). None of these
Multiple Choice Question Answer: c
_________ is the water that form lather directly with the soap.
(A). Â Hard water
(B). Â Soft water
(C). Â Partially hard water
(D). Â Very hard water
(E). None of these
Multiple Choice Question Answer: b
By Titrating the fixed volume of water against the standard __________ solution we can determine the total hardness of the water.
(A). Â Soap
(B). Â Alkaline soap
(C). Â Acidic soap
(D). Â Alcoholic soap
(E). None of these
Multiple Choice Question Answer: d
__________ the indicator used in the EDTA method.
(A). Â Benzene
(B). Â Phenopthalene
(C). Â Ethylene diamine
(D). Â Erichrome black T
(E). None of these
Multiple Choice Question Answer: d
The definition of soap is the soap-consuming capacity of a water sample.
(A). Â True
(B). Â False
(E). None of these
Multiple Choice Question Answer: a
___________ is the hardness a soft water contains.
(A). Â 0-45ppm
(B). Â 0-55ppm
(C). Â 0-65ppm
(D). Â 0-75ppm
(E). None of these
Multiple Choice Question Answer: d
________ is also called EDTA method.
(A). Â Complexometric titration
(C). Â Complement titration
(D). Â Complexion titration
(E). None of these
Multiple Choice Question Answer: a
By the___ types estimation of the hardness of water can be determined.
(A). Â 2
(B). Â 3
(C). Â 4
(D). Â 5
(E). None of these
Multiple Choice Question Answer: a
To form ________ with metal ions EDTA has the ability .
(A). Â Stable complexes
(B). Â Unstable complexes
(C). Â Salts
(D). Â Acids
(E). None of these
Multiple Choice Question Answer: a
The metal dye complex has the_______ color at PH of 10.
(A). Â Wine red
(B). Â Blue
(C). Â Green
(D). Â Pink
(E). None of these
Multiple Choice Question Answer: a
________ grams of EDTA is dissolved in the one litre of water to prepare EDTA solution.
(A). Â 1
(B). Â 2
(C). Â 3
(D). Â 4
(E). None of these
Multiple Choice Question Answer: d
The standard hard water is prepared to ensure that each of ml must contain _______ mg of CaCO3.
(A). Â 1
(B). Â 2
(C). Â 3
(D). Â 4
(E). None of these
Multiple Choice Question Answer: a
The moderately hard water conatains the hardness of ____________
(A). Â 75-150ppm
(B). Â 75-120ppm
(C). Â 75-130ppm
(D). Â 75-100ppm
(E). None of these
Multiple Choice Question Answer: a
Dye and dye metal complex have the __________ colour.
(A). Â Same
(B). Â Different
(C). Â Same in only some cases
(D). Â Cannot be known
(E). None of these
Multiple Choice Question Answer: b
The formula of total hardness can be given by ________
(A). Â Temporary + permanent hardness
(B).  Temporary – permanent hardness
(C). Â Temporary * permanent hardness
(D). Â Temporary/permanent hardness
(E). None of these
Multiple Choice Question Answer: a
In the EDTA method, ________ drops of the indicator is used.
(A). Â 1 to 2 drops
(B). Â 2 to 3 drops
(C). Â 2 to 4 drops
(D). Â 5 to 8 drops
(E). None of these
Multiple Choice Question Answer: a
PH of __________ must be present in the EDTA solution in the buffer used.
(A). Â 20
(B). Â 15
(C). Â 10
(D). Â 5
(E). None of these
Multiple Choice Question Answer: c
At the PH of _______ the change in color is sharper.
(A). Â 5
(B). Â 10
(C). Â 15
(D). Â 20
(E). None of these
Multiple Choice Question Answer: b
CaCO3 is given by __________ for the very hard water’s hardness.
(A). Â 100-200ppm
(B). Â 100-300ppm
(C). Â 200-300ppm
(D). Â Above 300ppm
(E). None of these
Multiple Choice Question Answer: c
Drinking water has the ________ PH value.
(A). Â 6.5-8.5
(B). Â 5.5-6.5
(C). Â 4.5-5.5
(D). Â 3.5-4.5
(E). None of these
Multiple Choice Question Answer: a
The amount of iron in drinking water is can range about______
(A). Â 1-1.5ppm
(B). Â 0.01-0.1ppm
(C). Â 1-1.1ppm
(D). Â 0.1-1ppm
(E). None of these
Multiple Choice Question Answer: d
The amount of phosphate in drinking water can have the range of ______
(A). Â 5-10ppm
(B). Â 10-15ppm
(C). Â 15-20ppm
(D). Â 20-25ppm
(E). None of these
Multiple Choice Question Answer: b
The amount of organic matter in drinking water must be ______
(A). Â 0.2-1.0ppm
(B). Â 1.0-2.0ppm
(C). Â 2.0-3.0ppm
(D). Â 3.0-4.0ppm
(E). None of these
Multiple Choice Question Answer: a
Soluble salts turn into insoluble salts when the eater is heated during the filtration in ______ and removed after filtration.
(A). Â Temporary hardness
(B). Â Permanent hardness
(C). Â Non-carbonate
(D). Â Non-alkaline
(E). None of these
Multiple Choice Question Answer: a
Magnesium limit in drinking water is about ___________
(A). Â 10-150ppm
(B). Â 20-150ppm
(C). Â 30-150ppm
(D). Â 40-150ppm
(E). None of these
Multiple Choice Question Answer: c
The amount of chloride in the drinking water range can be about __________
(A). Â 200-600ppm
(B). Â 300-600ppm
(C). Â 400-600ppm
(D). Â 500-600ppm
(E). None of these
Multiple Choice Question Answer: a
Permanent hardness in water does not produce the_____________
(A). Â Nitrates
(B). Â Sulphates
(C). Â Chlorides
(E). None of these
Multiple Choice Question Answer: d
Select the process that does not remove the permanent hardness of water?
(A). Â Lime-soda
(B). Â Ion exchange process
(C). Â Zeolite process
(D). Â Heating
(E). None of these
Multiple Choice Question Answer: c
Choose one of the following options: Carbonate and bicarbonates are
(A). Â Alkaline
(B). Â Acidic
(C). Â Highly acidic
(D). Â Neutral
(E). None of these
Multiple Choice Question Answer: a
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