Q. What is the main effect of heavy metal pollution in water bodies?
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A.
Increased biodiversity
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B.
Eutrophication
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C.
Bioaccumulation
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D.
Oxygenation
Solution
Heavy metal pollution can lead to bioaccumulation in aquatic organisms, which can have harmful effects on the food chain.
Correct Answer: C — Bioaccumulation
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Q. What is the main environmental concern associated with the use of chlorofluorocarbons (CFCs)?
-
A.
Ozone layer depletion
-
B.
Global warming
-
C.
Acid rain
-
D.
Water pollution
Solution
Chlorofluorocarbons (CFCs) are primarily known for their role in ozone layer depletion.
Correct Answer: A — Ozone layer depletion
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Q. What is the main feature of a primary alcohol?
-
A.
The hydroxyl group is attached to a carbon with one alkyl group
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B.
The hydroxyl group is attached to a carbon with two alkyl groups
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C.
The hydroxyl group is attached to a carbon with three alkyl groups
-
D.
The hydroxyl group is attached to a carbon in a ring
Solution
A primary alcohol has the hydroxyl group (-OH) attached to a carbon atom that is bonded to only one other carbon atom.
Correct Answer: A — The hydroxyl group is attached to a carbon with one alkyl group
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Q. What is the main feature of addition polymerization?
-
A.
Involves the loss of small molecules
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B.
Involves the addition of monomers without by-products
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C.
Requires a catalyst
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D.
Involves the formation of cross-linked structures
Solution
Addition polymerization involves the addition of monomers to form a polymer without the loss of small molecules.
Correct Answer: B — Involves the addition of monomers without by-products
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Q. What is the main feature of addition polymers?
-
A.
They release small molecules during polymerization
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B.
They are formed from monomers with double bonds
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C.
They have a high degree of crystallinity
-
D.
They are always biodegradable
Solution
Addition polymers are formed from monomers that contain double bonds, which open up to form long chains.
Correct Answer: B — They are formed from monomers with double bonds
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Q. What is the main feature of aromatic compounds?
-
A.
Presence of double bonds
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B.
Presence of a benzene ring
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C.
Presence of hydroxyl groups
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D.
Presence of carboxylic groups
Solution
Aromatic compounds are characterized by the presence of a benzene ring.
Correct Answer: B — Presence of a benzene ring
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Q. What is the main feature of condensation polymerization?
-
A.
It produces small molecules as byproducts
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B.
It requires high temperatures
-
C.
It involves ionic bonds
-
D.
It is a reversible reaction
Solution
Condensation polymerization produces small molecules, such as water, as byproducts.
Correct Answer: A — It produces small molecules as byproducts
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Q. What is the main feature of elastomers?
-
A.
High tensile strength
-
B.
Elasticity
-
C.
Brittleness
-
D.
Thermal stability
Solution
Elastomers are characterized by their elasticity, allowing them to stretch and return to their original shape.
Correct Answer: B — Elasticity
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Q. What is the main feature of terminal alkynes?
-
A.
They have a triple bond in the middle
-
B.
They can form carbanions
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C.
They are less acidic than alkenes
-
D.
They cannot undergo substitution reactions
Solution
Terminal alkynes can form carbanions due to the acidity of the hydrogen atom attached to the sp-hybridized carbon.
Correct Answer: B — They can form carbanions
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Q. What is the main feature that distinguishes alkynes from alkenes?
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A.
Presence of double bonds
-
B.
Presence of triple bonds
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C.
Saturation
-
D.
Molecular weight
Solution
Alkynes are distinguished from alkenes by the presence of triple bonds.
Correct Answer: B — Presence of triple bonds
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Q. What is the main function of a salt bridge in a galvanic cell?
-
A.
To provide a path for electrons
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B.
To maintain charge balance
-
C.
To increase voltage
-
D.
To decrease resistance
Solution
The main function of a salt bridge is to maintain charge balance by allowing ions to flow.
Correct Answer: B — To maintain charge balance
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Q. What is the main function of carbohydrates in living organisms?
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A.
Genetic information
-
B.
Energy storage
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C.
Catalysis
-
D.
Structural support
Solution
The main function of carbohydrates is energy storage and providing energy to living organisms.
Correct Answer: B — Energy storage
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Q. What is the main function of lipids in biological systems?
-
A.
Energy storage
-
B.
Genetic information
-
C.
Catalysis
-
D.
Structural support
Solution
Lipids primarily function in energy storage, as well as forming cell membranes.
Correct Answer: A — Energy storage
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Q. What is the main industrial method for producing hydrogen?
-
A.
Electrolysis of water
-
B.
Steam reforming of natural gas
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C.
Thermal decomposition of water
-
D.
Photosynthesis
Solution
The main industrial method for producing hydrogen is steam reforming of natural gas.
Correct Answer: B — Steam reforming of natural gas
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Q. What is the main ingredient in most sunscreens?
-
A.
Zinc oxide
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B.
Vitamin E
-
C.
Aloe vera
-
D.
Coconut oil
Solution
Zinc oxide is a common active ingredient in sunscreens that protects against UV rays.
Correct Answer: A — Zinc oxide
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Q. What is the main ingredient in vinegar that gives it its sour taste?
-
A.
Acetic acid
-
B.
Citric acid
-
C.
Lactic acid
-
D.
Formic acid
Solution
Vinegar contains acetic acid, which is responsible for its sour taste.
Correct Answer: A — Acetic acid
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Q. What is the main ingredient in vinegar?
-
A.
Acetic acid
-
B.
Citric acid
-
C.
Lactic acid
-
D.
Formic acid
Solution
Vinegar primarily consists of acetic acid, which gives it its sour taste.
Correct Answer: A — Acetic acid
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Q. What is the main mechanism of heat transfer in liquids and gases?
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
Insulation
Solution
Convection is the primary mechanism of heat transfer in liquids and gases due to the movement of the fluid.
Correct Answer: B — Convection
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Q. What is the main mechanism of heat transfer in liquids?
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
Insulation
Solution
In liquids, convection is the main mechanism of heat transfer, as the fluid moves and carries heat with it.
Correct Answer: B — Convection
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Q. What is the main monomer used to produce polyethylene?
-
A.
Propylene
-
B.
Ethylene
-
C.
Butylene
-
D.
Styrene
Solution
Ethylene is the main monomer used to produce polyethylene through addition polymerization.
Correct Answer: B — Ethylene
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Q. What is the main product of nuclear fusion in stars?
-
A.
Helium
-
B.
Hydrogen
-
C.
Carbon
-
D.
Iron
Solution
The main product of nuclear fusion in stars is helium.
Correct Answer: A — Helium
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Q. What is the main product of the complete combustion of alkanes?
-
A.
Carbon monoxide
-
B.
Carbon dioxide
-
C.
Water
-
D.
Oxygen
Solution
The main products of the complete combustion of alkanes are carbon dioxide and water.
Correct Answer: B — Carbon dioxide
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Q. What is the main product of the complete combustion of hydrocarbons?
-
A.
Carbon monoxide
-
B.
Water
-
C.
Carbon dioxide
-
D.
Hydrogen gas
Solution
The complete combustion of hydrocarbons produces carbon dioxide and water.
Correct Answer: C — Carbon dioxide
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Q. What is the main product of the complete combustion of propane (C3H8)?
-
A.
Carbon monoxide
-
B.
Carbon dioxide and water
-
C.
Soot
-
D.
Hydrogen gas
Solution
The complete combustion of propane produces carbon dioxide and water.
Correct Answer: B — Carbon dioxide and water
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Q. What is the main product of the dehydration of an alcohol?
-
A.
Alkene
-
B.
Alkane
-
C.
Aldehyde
-
D.
Ketone
Solution
The dehydration of an alcohol typically yields an alkene.
Correct Answer: A — Alkene
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Q. What is the main product of the dehydration of ethanol?
-
A.
Ethylene
-
B.
Acetaldehyde
-
C.
Ethane
-
D.
Diethyl ether
Solution
The dehydration of ethanol primarily produces ethylene (ethene) through the elimination of water.
Correct Answer: A — Ethylene
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Q. What is the main product of the electrolysis of water?
-
A.
Hydrogen gas
-
B.
Oxygen gas
-
C.
Hydrochloric acid
-
D.
Hydrogen peroxide
Solution
The main products of the electrolysis of water are hydrogen gas (H2) and oxygen gas (O2).
Correct Answer: A — Hydrogen gas
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Q. What is the main product of the hydrogenation of benzene?
-
A.
Cyclohexane
-
B.
Toluene
-
C.
Phenol
-
D.
Benzaldehyde
Solution
The hydrogenation of benzene results in the formation of cyclohexane, a saturated hydrocarbon.
Correct Answer: A — Cyclohexane
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Q. What is the main product of the hydrolysis of an ester?
-
A.
Alcohol
-
B.
Carboxylic acid
-
C.
Alkene
-
D.
Ketone
Solution
The hydrolysis of an ester produces a carboxylic acid and an alcohol.
Correct Answer: B — Carboxylic acid
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Q. What is the main product of the nitration of benzene?
-
A.
Nitrobenzene
-
B.
Benzene-1,2-diol
-
C.
Benzaldehyde
-
D.
Benzyl alcohol
Solution
The nitration of benzene typically produces nitrobenzene as the main product through electrophilic substitution.
Correct Answer: A — Nitrobenzene
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