This set of Hazardous Waste Management Multiple Choice Questions & Answers (MCQs) focuses on “Chemical Treatment – Neutralization”.
1. Suitable method for treating acidic or basic hazardous waste is _________
a) Neutralisation
b) Precipitation
c) Hydrolysis
d) Electrolysis
View Answer
Explanation: When a hazardous waste has either high or low pH the most suitable treatment method adopted is neutralisation.
2. Neutralisation involves addition of _________ substances with the waste.
a) Hydraulic
b) Chemical
c) Physical
d) Biological
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Explanation: Neutralisation involves addition of chemical substances to waste which is either acidic or basic, to change pH to neutral level i.e. 6‐8.
3. Complete the equation.
Acid + Base = __________ + water.
a) Salt
b) Chemical
c) Alkali
d) pH
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Explanation: Acid and base mixed together reacts to neutralize the acid and base properties, producing a salt.
4. Common reagents for neutralising acid wastes are __________
a) Sodium
b) Lime and sodium hydroxide
c) Lime and zinc
d) Lead
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Explanation: Acidic hazardous wastes are neutralised with slaked lime, caustic soda or sodium hydroxide.
5. Common reagents for neutralising alkaline wastes are ________
a) Sulphuric and HCl
b) Lime and sodium hydroxide
c) Lime and zinc
d) Lead
View Answer
Explanation: Alkaline hazardous wastes are neutralised with strong mineral acid such as Sulphuric acid, hydrochloric acid or with carbon-di-oxide.
6. Dissolved salts of hazardous metal wastes can be treated by neutralisation.
a) True
b) False
View Answer
Explanation: Acidic or alkaline solutions which includes dissolved salts of metals which forms insoluble species can be treated by neutralisation by varying pH.
7. Neutralisation process is extensively applied for ________ hazardous waste.
a) Reactive
b) Neutral
c) Corrosive
d) Chemical
View Answer
Explanation: Neutralization process is used on corrosive hazardous waste to reduce the corrosivity level of the waste.
8. Neutralisation adjusts pH level of corrosive between ____ and ____
a) 5, 9
b) 5.5, 9.5
c) 6, 7
d) 7, 8
View Answer
Explanation: The neutralization procedure adjusts the pH level of the corrosive waste to a pH between 5.5 and 9.5. The purpose of neutralisation is to alter the corrosive characteristic of the waste so that it can be disposed in a non-hazardous way.
9. Personal protective equipment should be worn while neutralising corrosive hazardous waste.
a) True
b) False
View Answer
Explanation: Personal protective equipment such as face shield, nitrile gloves and acid resistant apron should be worn while treating corrosive HW for safe management.
10. The process of neutralizing waste as listed in WAC 173-303-090 is known as ____________
a) Elementary neutralization
b) Chemical neutralization
c) Physical neutralization
d) Biological neutralization
View Answer
Explanation: The elementary neutralization method reduces a material’s corrosivity to pH range 6 to 9 and makes it less hazardous.
Sanfoundry Global Education & Learning Series – Hazardous Waste Management.
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