Q. What is the main feature of elastomers?
-
A.
High tensile strength
-
B.
Elasticity
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C.
Brittleness
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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
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B.
They can form carbanions
-
C.
They are less acidic than alkenes
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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?
-
A.
Presence of double bonds
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B.
Presence of triple bonds
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C.
Saturation
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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
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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?
-
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
-
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 monomer used to produce polyethylene?
-
A.
Propylene
-
B.
Ethylene
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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 the complete combustion of alkanes?
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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?
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A.
Alkene
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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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Q. What is the main product of the oxidation of a primary alcohol?
-
A.
Aldehyde
-
B.
Ketone
-
C.
Carboxylic acid
-
D.
Alcohol
Solution
Oxidation of a primary alcohol typically leads to the formation of a carboxylic acid.
Correct Answer: C — Carboxylic acid
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Q. What is the main product of the reaction between an alcohol and a carboxylic acid?
-
A.
Ester
-
B.
Ether
-
C.
Aldehyde
-
D.
Ketone
Solution
The reaction between an alcohol and a carboxylic acid typically produces an ester.
Correct Answer: A — Ester
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Q. What is the main product of the reaction between ethene and bromine?
-
A.
Bromobutane
-
B.
1,2-Dibromoethane
-
C.
Bromoethane
-
D.
Ethyl bromide
Solution
The reaction of ethene with bromine results in the formation of 1,2-dibromoethane through an electrophilic addition mechanism.
Correct Answer: B — 1,2-Dibromoethane
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Q. What is the main product of the reaction between hydrogen and oxygen?
-
A.
Ozone
-
B.
Water
-
C.
Hydrogen peroxide
-
D.
Hydrochloric acid
Solution
The main product of the reaction between hydrogen and oxygen is water (H2O).
Correct Answer: B — Water
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Q. What is the main product of the reaction between sodium and chlorine?
-
A.
NaCl
-
B.
NaCl2
-
C.
Na2Cl
-
D.
Na2Cl2
Solution
The main product of the reaction between sodium and chlorine is sodium chloride (NaCl).
Correct Answer: A — NaCl
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Q. What is the main product of the reaction of 1-chloropropane with magnesium in dry ether?
-
A.
Propane
-
B.
Grignard reagent
-
C.
Propyl chloride
-
D.
Magnesium chloride
Solution
The reaction forms a Grignard reagent, which is an organomagnesium compound.
Correct Answer: B — Grignard reagent
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Q. What is the main product of the reaction of benzene with bromine in the presence of FeBr3?
-
A.
Bromobenzene
-
B.
Benzyl bromide
-
C.
Bromobenzyl alcohol
-
D.
Benzene remains unchanged
Solution
The reaction of benzene with bromine in the presence of FeBr3 leads to the formation of bromobenzene through electrophilic aromatic substitution.
Correct Answer: A — Bromobenzene
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Q. What is the main product of the reaction of ethene with ozone followed by zinc reduction?
-
A.
Acetaldehyde
-
B.
Ethylene glycol
-
C.
Acetic acid
-
D.
Ethane
Solution
The ozonolysis of ethene followed by zinc reduction yields acetaldehyde.
Correct Answer: A — Acetaldehyde
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Q. What is the main product of the thermal decomposition of calcium carbonate?
-
A.
Calcium oxide
-
B.
Calcium hydroxide
-
C.
Carbon dioxide
-
D.
Calcium bicarbonate
Solution
The thermal decomposition of calcium carbonate produces calcium oxide and carbon dioxide.
Correct Answer: A — Calcium oxide
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Q. What is the main product when 1-bromopropane is treated with aqueous KOH?
-
A.
Propene
-
B.
1-propanol
-
C.
2-propanol
-
D.
No reaction
Solution
1-bromopropane reacts with aqueous KOH to undergo substitution, yielding 1-propanol as the main product.
Correct Answer: B — 1-propanol
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