Q. What type of reaction occurs when an amine reacts with a nitrous acid?
-
A.
Substitution
-
B.
Elimination
-
C.
Decomposition
-
D.
Diazotization
Solution
The reaction of an amine with nitrous acid leads to diazotization, forming a diazonium salt.
Correct Answer:
D
— Diazotization
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Q. What type of reaction occurs when chlorobenzene is treated with magnesium in dry ether? (2019)
-
A.
Grignard reaction
-
B.
Nucleophilic substitution
-
C.
Electrophilic substitution
-
D.
Reduction reaction
Solution
The reaction of chlorobenzene with magnesium in dry ether forms a Grignard reagent, which is a key step in organic synthesis.
Correct Answer:
A
— Grignard reaction
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Q. What type of reaction occurs when chlorobenzene is treated with sodium hydroxide at high temperature?
-
A.
Nucleophilic substitution
-
B.
Electrophilic substitution
-
C.
Elimination
-
D.
Addition
Solution
Chlorobenzene undergoes nucleophilic substitution to form phenol when treated with sodium hydroxide at high temperature.
Correct Answer:
A
— Nucleophilic substitution
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Q. What type of reaction occurs when ethene is converted to ethane? (2020)
-
A.
Hydrogenation
-
B.
Dehydrogenation
-
C.
Halogenation
-
D.
Hydrolysis
Solution
The conversion of ethene to ethane involves the addition of hydrogen, which is known as hydrogenation.
Correct Answer:
A
— Hydrogenation
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Q. What type of reaction occurs when ethene reacts with bromine?
-
A.
Substitution
-
B.
Addition
-
C.
Elimination
-
D.
Oxidation
Solution
The reaction between ethene and bromine is an addition reaction, forming dibromoethane.
Correct Answer:
B
— Addition
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Q. What type of reaction occurs when haloalkanes react with alcoholic KOH?
-
A.
Nucleophilic substitution
-
B.
Elimination
-
C.
Addition
-
D.
Redox
Solution
Haloalkanes react with alcoholic KOH primarily through nucleophilic substitution to form alcohols.
Correct Answer:
B
— Elimination
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Q. What type of reaction occurs when haloalkanes react with aqueous KOH?
-
A.
Nucleophilic substitution
-
B.
Elimination
-
C.
Addition
-
D.
Redox
Solution
Haloalkanes react with aqueous KOH primarily through nucleophilic substitution to form alcohols.
Correct Answer:
A
— Nucleophilic substitution
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Q. What type of reaction occurs when haloalkanes react with metals like magnesium?
-
A.
Substitution
-
B.
Elimination
-
C.
Addition
-
D.
Grignard formation
Solution
The reaction of haloalkanes with metals like magnesium leads to Grignard formation, which is a key step in organic synthesis.
Correct Answer:
D
— Grignard formation
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Q. What type of reaction occurs when haloalkanes react with metals like zinc?
-
A.
Substitution
-
B.
Elimination
-
C.
Reduction
-
D.
Oxidation
Solution
The reaction of haloalkanes with metals like zinc is a reduction reaction, forming alkanes.
Correct Answer:
C
— Reduction
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Q. What type of reaction occurs when haloalkanes react with nucleophiles? (2020)
-
A.
Elimination
-
B.
Substitution
-
C.
Addition
-
D.
Redox
Solution
Haloalkanes typically undergo nucleophilic substitution reactions where the halogen is replaced by a nucleophile.
Correct Answer:
B
— Substitution
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Q. What type of reaction occurs when phenol is treated with sodium hydroxide?
-
A.
Neutralization
-
B.
Esterification
-
C.
Saponification
-
D.
Nucleophilic substitution
Solution
Phenol reacts with sodium hydroxide in a nucleophilic substitution reaction to form phenoxide ion.
Correct Answer:
D
— Nucleophilic substitution
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Q. What type of reaction occurs when phenol is treated with sodium metal?
-
A.
Oxidation
-
B.
Reduction
-
C.
Esterification
-
D.
Wurtz reaction
Solution
The reaction of phenol with sodium metal leads to the formation of biphenyl through the Wurtz reaction.
Correct Answer:
D
— Wurtz reaction
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Q. What type of reaction occurs when phenol reacts with bromine? (2023)
-
A.
Electrophilic substitution
-
B.
Nucleophilic substitution
-
C.
Addition
-
D.
Elimination
Solution
Phenol undergoes electrophilic substitution when it reacts with bromine, resulting in brominated phenols.
Correct Answer:
A
— Electrophilic substitution
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Q. What type of reaction occurs when two amino acids form a peptide bond?
-
A.
Hydrolysis
-
B.
Condensation
-
C.
Redox
-
D.
Substitution
Solution
The formation of a peptide bond between two amino acids is a condensation reaction, releasing water.
Correct Answer:
B
— Condensation
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Q. What type of reproduction is most common in unicellular organisms? (2020)
-
A.
Sexual reproduction
-
B.
Asexual reproduction
-
C.
Biparental reproduction
-
D.
Alternation of generations
Solution
Asexual reproduction is most common in unicellular organisms, allowing for quick population growth.
Correct Answer:
B
— Asexual reproduction
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Q. What type of reproduction is primarily observed in bryophytes? (2020)
-
A.
Asexual reproduction
-
B.
Sexual reproduction
-
C.
Both asexual and sexual reproduction
-
D.
Vegetative reproduction
Solution
Bryophytes can reproduce both sexually, through gametes, and asexually, through fragmentation or budding.
Correct Answer:
C
— Both asexual and sexual reproduction
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Q. What type of reproduction is primarily observed in ferns? (2020)
-
A.
Asexual reproduction
-
B.
Sexual reproduction
-
C.
Vegetative reproduction
-
D.
All of the above
Solution
Ferns primarily reproduce sexually through spores, although they can also reproduce asexually.
Correct Answer:
B
— Sexual reproduction
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Q. What type of reproduction is primarily observed in flowering plants? (2022)
-
A.
Asexual reproduction
-
B.
Vegetative propagation
-
C.
Sexual reproduction
-
D.
Budding
Solution
Flowering plants primarily reproduce sexually through the formation of flowers and seeds.
Correct Answer:
C
— Sexual reproduction
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Q. What type of reproduction is primarily seen in algae? (2019)
-
A.
Asexual reproduction
-
B.
Sexual reproduction
-
C.
Both asexual and sexual reproduction
-
D.
Vegetative reproduction
Solution
Algae can reproduce both asexually and sexually, depending on environmental conditions.
Correct Answer:
C
— Both asexual and sexual reproduction
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Q. What type of reproduction is primarily seen in ferns? (2021)
-
A.
Asexual reproduction
-
B.
Sexual reproduction
-
C.
Both asexual and sexual reproduction
-
D.
Vegetative reproduction
Solution
Ferns primarily reproduce sexually through spores, although they can also reproduce asexually.
Correct Answer:
B
— Sexual reproduction
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Q. What type of reproduction occurs in flowering plants? (2021)
-
A.
Asexual reproduction
-
B.
Sexual reproduction
-
C.
Both asexual and sexual
-
D.
None of the above
Solution
Flowering plants can reproduce both sexually (through seeds) and asexually (through vegetative propagation).
Correct Answer:
C
— Both asexual and sexual
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Q. What type of reproduction occurs in hydra? (2023)
-
A.
Budding
-
B.
Binary fission
-
C.
Fragmentation
-
D.
Sexual reproduction
Solution
Hydra reproduces asexually by budding, where a new individual develops from an outgrowth of the parent.
Correct Answer:
A
— Budding
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Q. What type of reproduction occurs in sponges? (2020)
-
A.
Asexual reproduction only
-
B.
Sexual reproduction only
-
C.
Both asexual and sexual reproduction
-
D.
None of the above
Solution
Sponges can reproduce both asexually through budding and sexually by producing gametes.
Correct Answer:
C
— Both asexual and sexual reproduction
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Q. What type of root system is found in monocots? (2021)
-
A.
Tap root system
-
B.
Fibrous root system
-
C.
Adventitious root system
-
D.
None of the above
Solution
Monocots typically have a fibrous root system, which consists of many thin roots.
Correct Answer:
B
— Fibrous root system
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Q. What type of semiconductor behavior is exhibited by a material with a very small band gap?
-
A.
Insulator
-
B.
Conductor
-
C.
Superconductor
-
D.
Semiconductor
Solution
A material with a very small band gap behaves like a semiconductor, allowing some charge carriers to be thermally excited.
Correct Answer:
D
— Semiconductor
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Q. What type of semiconductor is formed by adding trivalent impurities? (2023)
-
A.
N-type
-
B.
P-type
-
C.
Intrinsic
-
D.
Superconductor
Solution
Adding trivalent impurities (like boron) to a semiconductor creates a p-type semiconductor.
Correct Answer:
B
— P-type
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Q. What type of semiconductor is formed when silicon is doped with arsenic? (2023)
-
A.
p-type
-
B.
n-type
-
C.
Intrinsic
-
D.
Superconductor
Solution
Doping silicon with arsenic, a pentavalent element, creates an n-type semiconductor due to the addition of extra electrons.
Correct Answer:
B
— n-type
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Q. What type of semiconductor is formed when silicon is doped with phosphorus?
-
A.
p-type
-
B.
n-type
-
C.
Intrinsic
-
D.
Superconductor
Solution
Doping silicon with phosphorus creates an n-type semiconductor due to the extra electrons contributed by phosphorus.
Correct Answer:
B
— n-type
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Q. What type of solid is diamond classified as? (2022)
-
A.
Metallic solid
-
B.
Ionic solid
-
C.
Covalent network solid
-
D.
Molecular solid
Solution
Diamond is classified as a covalent network solid due to its strong covalent bonds forming a three-dimensional network.
Correct Answer:
C
— Covalent network solid
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Q. What type of solutions does Raoult's Law apply to most accurately?
-
A.
Ideal solutions
-
B.
Non-ideal solutions
-
C.
Concentrated solutions
-
D.
Dilute solutions
Solution
Raoult's Law applies most accurately to ideal solutions, where interactions between different molecules are similar to those in pure substances.
Correct Answer:
A
— Ideal solutions
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