Iron and manganese present as pollutants in water cannot be removed by________

A Oxidation followed by settling and filtration
B Chlorination
C Ion exchange process
D Lime soda process or manganese zeolite process

Correct Answer: Chlorination

Water chlorination is the process of adding chlorine or hypochlorite to water. This method is used to kill certain bacteria and other microbes in tap water as chlorine is highly toxic. In particular, chlorination is used to prevent the spread of waterborne diseases such as cholera, dysentery, typhoid etc.
Bissoy MCQ
#General Knowledge #Chemistry

Related Questions

Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
A CO
B SO2
C NOx
D CFC (chloro fluoro carbons)
Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
A 1.5-2
B 3.5-4.5
C 7-9
D 12-14
A bidirectional relationship in class diagrams is described by________
A double-headed arrow
B visibility symbols
C single-headed arrow
D double diamond
Inheritance in class diagrams is depicted by________
A single-headed empty arrow
B single-headed filled arrow
C double-headed empty arrow
Presence of iron and manganese in water causes
A Reduction in its dissolved oxygen content
B Discoloration of bathroom fixtures
C Temporary hardness
D None of these
In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will
A Increase
B Decrease
C Remain the same
D Initially increase and then decrease
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
A Neutralised by alkali treatment
B Left as such without any treatment
C Diluted with fresh water to reduce its acidity
D None of these
Main pollutants released from iron and steel industry are
A CO, CO2 and SO2
B NO, SO3 and H2S
C CO2, H2S and NO2
D CO2, NO2 and SO3
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.
A Cementite
B Free graphite
C Both A and B
D None of these
Growth of __________ is promoted by the presence of manganese in water.
A Files
B Algae
C Micro-organisms
D Mosquitoes

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