Q. What type of bond is primarily found in organic compounds? (2023)
A.
Ionic bonds
B.
Covalent bonds
C.
Metallic bonds
D.
Hydrogen bonds
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Solution
Organic compounds primarily consist of covalent bonds formed between carbon and other atoms.
Correct Answer: B — Covalent bonds
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Q. What type of crystal system does a diamond belong to? (2023)
A.
Cubic
B.
Tetragonal
C.
Hexagonal
D.
Orthorhombic
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Solution
Diamond crystallizes in a cubic crystal system, specifically in a face-centered cubic lattice.
Correct Answer: A — Cubic
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Q. What type of isomerism is shown by compounds with the same molecular formula but different structural formulas? (2023)
A.
Geometric isomerism
B.
Structural isomerism
C.
Optical isomerism
D.
Conformational isomerism
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Solution
Structural isomerism occurs when compounds have the same molecular formula but different structural arrangements.
Correct Answer: B — Structural isomerism
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Q. What type of isomerism is shown by the amines CH3NH2 and C2H5NH2? (2023)
A.
Structural isomerism
B.
Geometric isomerism
C.
Optical isomerism
D.
Functional isomerism
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Solution
CH3NH2 (methylamine) and C2H5NH2 (ethylamine) exhibit structural isomerism as they have different carbon skeletons.
Correct Answer: A — Structural isomerism
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Q. What type of isomerism is shown by the complex [Co(en)2Cl2]+? (2021)
A.
Geometrical
B.
Optical
C.
Structural
D.
Coordination
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Solution
The complex [Co(en)2Cl2]+ can exhibit optical isomerism due to the presence of bidentate ligands (en = ethylenediamine) which can create non-superimposable mirror images.
Correct Answer: B — Optical
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Q. What type of isomerism is shown by the complex [Cr(en)3]3+? (2023)
A.
Geometrical
B.
Optical
C.
Linkage
D.
Coordination
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Solution
The complex [Cr(en)3]3+ shows optical isomerism because it contains bidentate ligands (en = ethylenediamine) that can create non-superimposable mirror images.
Correct Answer: B — Optical
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Q. What type of packing is observed in a body-centered cubic (BCC) structure? (2023)
A.
Hexagonal close packing
B.
Cubic close packing
C.
Simple cubic packing
D.
Body-centered packing
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Solution
The body-centered cubic (BCC) structure features body-centered packing, where one atom is at the center of the cube and eight atoms are at the corners.
Correct Answer: D — Body-centered packing
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Q. What type of packing is observed in hexagonal close-packed (HCP) structures? (2023)
A.
ABAB
B.
ABCABC
C.
AABB
D.
AAAB
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Solution
Hexagonal close-packed (HCP) structures exhibit ABCABC packing.
Correct Answer: B — ABCABC
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Q. What type of polymer is formed by the polymerization of isoprene? (2019)
A.
Natural rubber
B.
Nylon
C.
Polyethylene
D.
Teflon
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Solution
Natural rubber is formed by the polymerization of isoprene.
Correct Answer: A — Natural rubber
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Q. What type of polymer is rubber classified as? (2019)
A.
Thermoplastic
B.
Thermosetting
C.
Elastomer
D.
Composite
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Solution
Rubber is classified as an elastomer, which is a type of polymer that exhibits elastic properties.
Correct Answer: C — Elastomer
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Q. What type of reaction forms a disaccharide from two monosaccharides? (2022)
A.
Hydrolysis
B.
Condensation
C.
Oxidation
D.
Reduction
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Solution
A condensation reaction occurs when two monosaccharides combine to form a disaccharide, releasing water.
Correct Answer: B — Condensation
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Q. What type of reaction occurs when 1-bromopropane reacts with sodium cyanide? (2023)
A.
Elimination
B.
Substitution
C.
Addition
D.
Redox
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Solution
The reaction between 1-bromopropane and sodium cyanide is a nucleophilic substitution reaction, resulting in the formation of propanenitrile.
Correct Answer: B — Substitution
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Q. What type of reaction occurs when 1-bromopropane reacts with sodium ethoxide? (2023)
A.
Elimination
B.
Nucleophilic substitution
C.
Addition
D.
Oxidation
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Solution
The reaction of 1-bromopropane with sodium ethoxide is a nucleophilic substitution reaction where the ethoxide ion replaces the bromine atom.
Correct Answer: B — Nucleophilic substitution
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Q. What type of reaction occurs when 1-chlorobutane is treated with aqueous KOH? (2023)
A.
Elimination
B.
Substitution
C.
Addition
D.
Redox
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Solution
When 1-chlorobutane is treated with aqueous KOH, a nucleophilic substitution reaction occurs, resulting in the formation of butanol.
Correct Answer: B — Substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with aqueous KOH? (2023)
A.
Elimination
B.
Substitution
C.
Addition
D.
Redox
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Solution
The reaction of 1-chloropropane with aqueous KOH leads to an elimination reaction, forming propene.
Correct Answer: B — Substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with potassium cyanide? (2019)
A.
Nucleophilic substitution
B.
Electrophilic substitution
C.
Addition reaction
D.
Elimination reaction
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Solution
The reaction between 1-chloropropane and potassium cyanide is a nucleophilic substitution reaction, resulting in the formation of propanenitrile.
Correct Answer: A — Nucleophilic substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with sodium cyanide? (2023)
A.
Elimination
B.
Nucleophilic substitution
C.
Addition
D.
Redox
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Solution
The reaction between 1-chloropropane and sodium cyanide is a nucleophilic substitution reaction where the cyanide ion replaces the chlorine atom.
Correct Answer: B — Nucleophilic substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with sodium iodide in acetone? (2023)
A.
Elimination
B.
Nucleophilic substitution
C.
Addition
D.
Redox
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Solution
The reaction is a nucleophilic substitution (S_N2) where iodide ion replaces the chlorine atom.
Correct Answer: B — Nucleophilic substitution
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Q. What type of reaction occurs when 2-bromopropane is treated with aqueous KOH? (2023)
A.
Elimination
B.
Substitution
C.
Addition
D.
Redox
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Solution
The reaction of 2-bromopropane with aqueous KOH leads to an elimination reaction, forming propene.
Correct Answer: A — Elimination
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Q. What type of reaction occurs when an alcohol is oxidized? (2023)
A.
Reduction
B.
Dehydration
C.
Substitution
D.
Oxidation
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Solution
Oxidation of alcohols involves the loss of hydrogen or the gain of oxygen, leading to the formation of aldehydes, ketones, or carboxylic acids.
Correct Answer: D — Oxidation
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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
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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 phenol reacts with bromine? (2023)
A.
Electrophilic substitution
B.
Nucleophilic substitution
C.
Addition
D.
Elimination
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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 solid is diamond classified as? (2022)
A.
Metallic solid
B.
Ionic solid
C.
Covalent network solid
D.
Molecular solid
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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. Which alkali metal is known for its vigorous reaction with water? (2022)
A.
Lithium
B.
Sodium
C.
Potassium
D.
Rubidium
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Solution
Potassium (K) reacts vigorously with water, producing potassium hydroxide and hydrogen gas.
Correct Answer: C — Potassium
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Q. Which alkaline earth metal has the highest melting point? (2022)
A.
Beryllium
B.
Magnesium
C.
Calcium
D.
Barium
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Solution
Beryllium has the highest melting point among the alkaline earth metals.
Correct Answer: A — Beryllium
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Q. Which alkaline earth metal is known for its use in the production of lightweight alloys? (2023)
A.
Calcium
B.
Barium
C.
Magnesium
D.
Strontium
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Solution
Magnesium is widely used in the production of lightweight alloys due to its low density.
Correct Answer: C — Magnesium
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Q. Which alkaline earth metal is used in fireworks for its bright flame? (2021)
A.
Barium
B.
Calcium
C.
Strontium
D.
Magnesium
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Solution
Strontium (Sr) is used in fireworks to produce a bright red flame.
Correct Answer: C — Strontium
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Q. Which alkaline earth metal is used in fireworks for producing a bright white light? (2023)
A.
Barium
B.
Calcium
C.
Strontium
D.
Magnesium
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Solution
Strontium is used in fireworks to produce a bright red flame.
Correct Answer: C — Strontium
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Q. Which carboxylic acid is found in citrus fruits? (2023)
A.
Acetic acid
B.
Citric acid
C.
Lactic acid
D.
Formic acid
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Solution
Citric acid is the carboxylic acid found in citrus fruits, contributing to their sour taste.
Correct Answer: B — Citric acid
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Q. Which carboxylic acid is known for its role in the Krebs cycle? (2019)
A.
Citric acid
B.
Acetic acid
C.
Lactic acid
D.
Formic acid
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Solution
Citric acid plays a crucial role in the Krebs cycle, which is a key metabolic pathway.
Correct Answer: A — Citric acid
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