Question 21 : The hypochlorous acid is ______ times effective as hypochorite ions.
1. 10
2. 30
3. 50
4. 80
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Question 22 : The chemical formula of iodate is
1. HIO₃
2. HIO
3. HIO₂
4. H₂IO₂
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Question 23 : Chlorine which gets consumed in the oxidation of impurities before disinfection is
1. Free chlorine
2. Residual chlorine
3. Chlorine demand
4. Residual demand
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Question 24 : The process of chlorination with hypochlorites is called
1. Super chlorination
2. Pre chlorination
3. Post chlorination
4. Hypo-chlorination
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Question 25 : What happen to the concentration of iodine when the pH is between 6 and 8?
1. I2 decreases whereas HIO increases
2. I2 increases, whereas HIO decreases
3. Both I2 and HIO increases
4. Both I2 and HIO decreases
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Question 26 : In which form of chlorination, chlorine applies to raw water supply as it enters the distribution system?
1. Plain chlorination
2. Pre chlorination
3. Super chlorination
4. Double chlorination
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Question 27 : What happens during the breakdown of ozone?
1. CO₂ is formed
2. Nascent oxygen is formed
3. CO₂ and Nascent oxygen is formed
4. Formation of oxygen and water takes place.
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Question 28 : What is the chemical formula of bleaching powder?
1. Ca (OCl)₂
2. Ca (OCl)
3. Ca (OCl)₃
4. CaCl₂
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Question 29 : Which minor method of disinfection is effective in complete sterilization of water?
1. Boiling method
2. Excess lime treatment
3. Silver treatment
4. Ultraviolet ray treatment
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Question 30 : The integration of the expression of Chicks law is given by
1. N1/N = e^kt
2. N1/N = kt
3. N1/N = k/t
4. N1/N = e^-kt
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