Q. What is the main product of the complete combustion of ethane (C2H6)? (2023)
-
A.
Carbon dioxide and water
-
B.
Carbon monoxide and water
-
C.
Soot and water
-
D.
Hydrogen gas
Solution
The complete combustion of ethane produces carbon dioxide and water as the main products.
Correct Answer: A — Carbon dioxide and water
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Q. What is the main product of the complete combustion of methane? (2023)
-
A.
Carbon dioxide and water
-
B.
Carbon monoxide and water
-
C.
Carbon and hydrogen
-
D.
Oxygen and water
Solution
The complete combustion of methane (CH4) produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — Carbon dioxide and water
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Q. What is the main product of the fusion of hydrogen nuclei? (2022)
-
A.
Helium
-
B.
Carbon
-
C.
Oxygen
-
D.
Nitrogen
Solution
The fusion of hydrogen nuclei primarily produces helium, along with a release of energy.
Correct Answer: A — Helium
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Q. What is the main product of the oxidation of ethanol?
-
A.
Acetic acid
-
B.
Formic acid
-
C.
Butanoic acid
-
D.
Propanoic acid
Solution
The main product of the oxidation of ethanol is acetic acid.
Correct Answer: A — Acetic acid
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Q. What is the main product of the reaction between aluminum and hydrochloric acid? (2023)
-
A.
AlCl3
-
B.
H2
-
C.
Al(OH)3
-
D.
Al2Cl6
Solution
The main product of the reaction between aluminum and hydrochloric acid is hydrogen gas (H2).
Correct Answer: B — H2
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Q. What is the main product of the reaction between an acid and a base? (2019)
-
A.
Salt
-
B.
Water
-
C.
Hydrogen gas
-
D.
Carbon dioxide
Solution
The main products of the neutralization reaction between an acid and a base are salt and water.
Correct Answer: A — Salt
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Q. What is the main product of the reaction of 1-bromo-2-methylpropane with KOH in ethanol? (2020)
-
A.
2-methylpropene
-
B.
2-methylpropan-1-ol
-
C.
1-bromo-2-methylpropane
-
D.
2-bromo-2-methylpropane
Solution
The reaction of 1-bromo-2-methylpropane with KOH in ethanol leads to the formation of 2-methylpropene through an elimination reaction.
Correct Answer: A — 2-methylpropene
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Q. What is the main product of the thermal decomposition of ammonium dichromate? (2023)
-
A.
Cr2O3
-
B.
CrO3
-
C.
Cr
-
D.
NH3
Solution
The thermal decomposition of ammonium dichromate produces chromium(III) oxide (Cr2O3) as the main product.
Correct Answer: A — Cr2O3
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Q. What is the main product when 1-bromobutane reacts with sodium hydroxide in ethanol? (2021)
-
A.
Butanol
-
B.
Butene
-
C.
Sodium bromide
-
D.
Butyric acid
Solution
The reaction of 1-bromobutane with sodium hydroxide in ethanol leads to elimination, forming butene as the main product.
Correct Answer: B — Butene
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Q. What is the main product when 1-bromopropane is treated with alcoholic KOH? (2021)
-
A.
Propene
-
B.
1-propanol
-
C.
2-propanol
-
D.
Bromopropane
Solution
Alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-bromopropane.
Correct Answer: A — Propene
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Q. What is the main product when 1-bromopropane is treated with magnesium in dry ether? (2019)
-
A.
Propane
-
B.
Grignard reagent
-
C.
Bromopropane
-
D.
Propyl alcohol
Solution
The reaction of 1-bromopropane with magnesium in dry ether forms the Grignard reagent, propylmagnesium bromide.
Correct Answer: B — Grignard reagent
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Q. What is the main product when 1-chloropropane is treated with alcoholic KOH? (2019)
-
A.
Propene
-
B.
Propan-1-ol
-
C.
Propan-2-ol
-
D.
Chloropropane
Solution
Alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-chloropropane.
Correct Answer: A — Propene
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Q. What is the main product when 1-chloropropane is treated with excess alcoholic KOH? (2020)
-
A.
Propene
-
B.
1-Propanol
-
C.
2-Propanol
-
D.
Chloropropane
Solution
Excess alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-chloropropane.
Correct Answer: A — Propene
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Q. What is the main product when aluminum reacts with hydrochloric acid? (2023)
-
A.
AlCl3
-
B.
H2
-
C.
Al(OH)3
-
D.
Al2Cl6
Solution
When aluminum reacts with hydrochloric acid, hydrogen gas (H2) is produced along with aluminum chloride (AlCl3).
Correct Answer: B — H2
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Q. What is the main product when an amine reacts with a carbonyl compound? (2019)
-
A.
Amide
-
B.
Alcohol
-
C.
Aldehyde
-
D.
Ketone
Solution
The main product of the reaction between an amine and a carbonyl compound is an amide.
Correct Answer: A — Amide
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Q. What is the main product when an amine reacts with a haloalkane? (2019)
-
A.
Amide
-
B.
Quaternary ammonium salt
-
C.
Alcohol
-
D.
Ester
Solution
The main product of the reaction between an amine and a haloalkane is a quaternary ammonium salt.
Correct Answer: B — Quaternary ammonium salt
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Q. What is the main product when an amine reacts with an acyl chloride?
-
A.
Amide
-
B.
Ester
-
C.
Alcohol
-
D.
Aldehyde
Solution
The reaction of an amine with an acyl chloride produces an amide.
Correct Answer: A — Amide
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Q. What is the main product when an amine reacts with an alkyl halide?
-
A.
Amide
-
B.
Quaternary ammonium salt
-
C.
Alcohol
-
D.
Ester
Solution
The main product is a quaternary ammonium salt when an amine reacts with an alkyl halide, as the amine can be further alkylated.
Correct Answer: B — Quaternary ammonium salt
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Q. What is the main product when ethene reacts with bromine?
-
A.
Bromethane
-
B.
1,2-Dibromoethane
-
C.
Ethane
-
D.
Bromoethane
Solution
The reaction of ethene with bromine results in the formation of 1,2-dibromoethane.
Correct Answer: B — 1,2-Dibromoethane
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Q. What is the main product when ethene reacts with hydrogen in the presence of a catalyst?
-
A.
Ethane
-
B.
Ethanol
-
C.
Ethyl chloride
-
D.
Acetylene
Solution
The main product is ethane, formed by the hydrogenation of ethene.
Correct Answer: A — Ethane
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Q. What is the main product when hydrogen reacts with oxygen? (2019)
-
A.
Water
-
B.
Hydrogen peroxide
-
C.
Ozone
-
D.
Hydroxide
Solution
When hydrogen reacts with oxygen, the main product formed is water (H2O).
Correct Answer: A — Water
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Q. What is the main product when phenol is treated with bromine?
-
A.
Bromobenzene
-
B.
Bromophenol
-
C.
Benzene
-
D.
Bromobutane
Solution
Bromine reacts with phenol to form bromophenol, which is a substitution product.
Correct Answer: B — Bromophenol
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Q. What is the main product when phenol reacts with bromine? (2019)
-
A.
Bromobenzene
-
B.
Bromophenol
-
C.
Benzene
-
D.
No reaction
Solution
Phenol reacts with bromine to form Bromophenol, which is a brominated derivative of phenol.
Correct Answer: B — Bromophenol
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Q. What is the main product when phenol reacts with sodium hydroxide?
-
A.
Sodium phenoxide
-
B.
Sodium benzoate
-
C.
Benzene
-
D.
Phenyl acetate
Solution
Phenol reacts with sodium hydroxide to form sodium phenoxide, which is a salt of phenol.
Correct Answer: A — Sodium phenoxide
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Q. What is the main product when propan-2-one is treated with iodine in the presence of a base?
-
A.
Iodoform
-
B.
Acetone
-
C.
Bromoform
-
D.
Chloroform
Solution
Propan-2-one (acetone) reacts with iodine in the presence of a base to form Iodoform.
Correct Answer: A — Iodoform
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Q. What is the main product when propan-2-one is treated with sodium borohydride? (2023)
-
A.
Propan-1-ol
-
B.
Propan-2-ol
-
C.
Propan-3-ol
-
D.
No reaction
Solution
Sodium borohydride reduces propan-2-one to propan-2-ol, which is a secondary alcohol.
Correct Answer: B — Propan-2-ol
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Q. What is the main product when propanal is treated with sodium bisulfite? (2019)
-
A.
Sodium propanoate
-
B.
Propyl sulfonate
-
C.
Propane-1,2-diol
-
D.
A bisulfite adduct
Solution
Propanal reacts with sodium bisulfite to form a bisulfite adduct, which is a characteristic reaction of aldehydes.
Correct Answer: D — A bisulfite adduct
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Q. What is the main purpose of a choke in an AC circuit? (2022)
-
A.
To increase current
-
B.
To decrease current
-
C.
To store energy
-
D.
To convert AC to DC
Solution
A choke is used to decrease current in an AC circuit by providing inductive reactance.
Correct Answer: B — To decrease current
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Q. What is the main purpose of a Punnett square? (2020)
-
A.
To determine the phenotype
-
B.
To predict genetic variation
-
C.
To identify alleles
-
D.
To analyze pedigrees
Solution
A Punnett square is used to predict the genetic variation and possible genotypes of offspring from a genetic cross.
Correct Answer: B — To predict genetic variation
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Q. What is the main purpose of amniotic fluid? (2022)
-
A.
Protection of the fetus
-
B.
Nourishment of the fetus
-
C.
Gas exchange
-
D.
Hormonal regulation
Solution
Amniotic fluid serves to protect the fetus by cushioning it from physical shocks and providing a stable environment.
Correct Answer: A — Protection of the fetus
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