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WorksheetsAcids, Bases, and Wastewater Treatment Quiz
Total questions: 44
Worksheet time: 22mins
Which of the following is a strong acid?
HCl
CH₃COOH
H₂CO₃
HCN
Which of these is a weak acid?
Sulphuric acid
Nitric acid
Acetic acid
Hydrochloric acid
Which of the following acids is found in citrus fruits?
Tartaric acid
Citric acid
Oxalic acid
Formic acid
Concentrated H₂SO₄ is used as a:
Reducing agent
Oxidizing agent and dehydrating agent
Neutralizer
Salt producer
Which of the following is NOT a property of acids?
Sour taste
Turns blue litmus red
Produces H⁺ ions in solution
Slippery touch
Which of these is a strong base?
NaOH
NH₄OH
Ca(OH)₂
Mg(OH)₂
Ammonium hydroxide (NH₄OH) is a:
Strong base
Weak base
Neutral substance
Salt
Which property is common to all bases?
Sour taste
Slippery feel
Turns red litmus blue
Both b & c
Which base is used in antacids?
NaOH
Ca(OH)₂
Mg(OH)₂
KOH
Which base is called caustic potash?
NaOH
KOH
Ca(OH)₂
NH₄OH
Table salt is chemically:
Na₂CO₃
NaCl
Na₂SO₄
KCl
Plaster of Paris is chemically:
CaSO₄·½H₂O
CaSO₄·2H₂O
CaCO₃
CaCl₂
Washing soda is:
NaHCO₃
Na₂CO₃·10H₂O
K₂CO₃
NaCl
Baking soda is used in antacids because it:
Acts as an oxidizer
Neutralizes acid
Produces SO₂
Is acidic in nature
Which salt is used for making bleaching powder?
NaCl
KCl
CaSO₄
CaCl₂
pH scale measures:
Temperature
Acidity or alkalinity
Pressure
Conductivity
Neutral solution has a pH of:
0
7
14
1
Which of the following has pH less than 7?
NaOH
NH₄OH
HCl
Ca(OH)₂
Universal indicator is:
A single chemical
A mixture of dyes
A salt
A strong acid
Which indicator turns pink in basic solution?
Litmus
Methyl orange
Phenolphthalein
Universal indicator
Neutralization is a reaction between:
Acid + Salt
Base + Salt
Acid + Base
Salt + Salt
Which of the following is a neutralization reaction?
HCl + NaOH → NaCl + H₂O
CaCO₃ → CaO + CO₂
C + O₂ → CO₂
NaOH → Na⁺ + OH⁻
Which of these is an example of neutralization in daily life?
Use of lime on acidic soil
Photosynthesis
Respiration
Burning of coal
In medicine, neutralization is used in:
Vaccination
Antacids
Antibiotics
Painkillers
Why does bee sting pain reduce when baking soda is applied?
Baking soda is acidic
Baking soda neutralizes acid
Baking soda absorbs poison
Baking soda acts as cooling agent
Wastewater is defined as:
Pure water from rivers
Water that is safe to drink
Used water containing impurities
Distilled water
The first step of wastewater treatment in sewage plants is:
Sedimentation
Screening
Chlorination
Aeration
The treatment of wastewater is also called:
Chlorination
Sewage treatment
Filtration
Neutralization
In primary treatment, wastewater is allowed to:
Evaporate
Settle so solids sink
React with chlorine
Pass through sand filters
The settled material at the bottom of tanks is called:
Effluent
Sludge
Filtrate
Compost
Oil and grease from wastewater float at the top and are removed by:
Screening
Skimming
Filtration
Sedimentation
The main purpose of secondary treatment is:
Remove physical impurities
Remove dissolved & organic matter
Remove only sand particles
Sterilize water
The secondary treatment is mainly a:
Physical process
Biological process
Chemical process
Thermal process
Aeration in sewage treatment provides:
Heat
Oxygen for microorganisms
Nutrients for plants
Cooling of water
The by-product of anaerobic sludge digestion is:
Oxygen
Biogas
Hydrogen
Carbon monoxide
Activated sludge process uses:
Chemicals only
Microorganisms (bacteria)
Heating
Mechanical pressure
Tertiary treatment mainly removes:
Organic matter
Pathogens & dissolved chemicals
Sand and grit
Large particles
Chlorination in sewage treatment is used for:
Killing harmful bacteria
Removing sand
Settling sludge
Increasing oxygen level
Ozone treatment of wastewater is:
A physical method
A chemical disinfection method
A biological process
A mechanical process
UV radiation in wastewater treatment is used for:
Settling
Disinfection
Screening
Aeration
Which disease is commonly spread by untreated sewage?
Malaria
Typhoid
Arthritis
Diabetes
Which harmful gas is released from septic tanks?
Oxygen
Methane
Nitrogen
Neon
Industrial wastewater often contains:
Nutrients only
Toxic chemicals & heavy metals
Oxygen
Pure water
Untreated sewage in rivers leads to:
Increased oxygen level
Decreased dissolved oxygen
No effect on aquatic life
Pure water
