Q. Which of the following factors does NOT affect the rate of a chemical reaction? (2021) 2021
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A.
Concentration of reactants
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B.
Temperature
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C.
Presence of a catalyst
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D.
Color of the reactants
Solution
The color of the reactants does not affect the rate of a chemical reaction. The other factors directly influence the reaction rate.
Correct Answer: D — Color of the reactants
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Q. Which of the following haloalkanes is expected to be the most reactive in nucleophilic substitution reactions? (2023)
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A.
Chloroethane
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B.
Bromoethane
-
C.
Iodoethane
-
D.
Fluoroethane
Solution
Iodoethane is the most reactive due to the weaker C-I bond compared to C-Br, C-Cl, and C-F bonds.
Correct Answer: C — Iodoethane
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Q. Which of the following has the highest bond energy? (2023)
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A.
C-H
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B.
C-C
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C.
C=N
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D.
C≡C
Solution
C≡C (triple bond) has the highest bond energy due to the strong attraction between the two carbon atoms.
Correct Answer: D — C≡C
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Q. Which of the following has the highest ionization energy? (2020) 2020
Solution
Lithium (Li) has the highest ionization energy among the given options.
Correct Answer: A — Li
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Q. Which of the following has the lowest boiling point? (2023)
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A.
H2O
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B.
NH3
-
C.
CH4
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D.
HF
Solution
CH4 (methane) has the lowest boiling point due to weak London dispersion forces compared to the other molecules.
Correct Answer: C — CH4
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Q. Which of the following hydrocarbons is saturated?
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A.
C2H2
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B.
C3H6
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C.
C4H10
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D.
C5H8
Solution
C4H10 (butane) is a saturated hydrocarbon, containing only single bonds.
Correct Answer: C — C4H10
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Q. Which of the following ions has a d5 configuration?
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A.
Mn2+
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B.
Fe3+
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C.
Cr3+
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D.
V4+
Solution
Mn2+ has a d5 configuration as it loses two electrons from its 4s and 3d orbitals.
Correct Answer: A — Mn2+
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Q. Which of the following ions has a stable octet? (2023)
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A.
Na+
-
B.
Cl-
-
C.
Mg2+
-
D.
All of the above
Solution
All of the ions Na+, Cl-, and Mg2+ have achieved a stable octet configuration.
Correct Answer: D — All of the above
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Q. Which of the following is a base quantity? (2020)
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A.
Force
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B.
Energy
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C.
Length
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D.
Pressure
Solution
Length is a base quantity in the SI system, while force, energy, and pressure are derived quantities.
Correct Answer: C — Length
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Q. Which of the following is a base unit in the SI system? (2020)
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A.
Liter
-
B.
Meter
-
C.
Newton
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D.
Joule
Solution
Meter is a base unit in the SI system, while liter, newton, and joule are derived units.
Correct Answer: B — Meter
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Q. Which of the following is a bidentate ligand? (2020) 2020
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A.
NH3
-
B.
EDTA
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C.
Cl-
-
D.
H2O
Solution
EDTA can form multiple bonds with a metal ion, making it a bidentate ligand as it can attach at two sites.
Correct Answer: B — EDTA
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Q. Which of the following is a carbohydrate? (2023) 2023
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A.
Glucose
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B.
Amino acid
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C.
Fatty acid
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D.
Nucleotide
Solution
Glucose is a simple sugar and a primary carbohydrate.
Correct Answer: A — Glucose
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Q. Which of the following is a carboxylic acid?
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A.
C2H5OH
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B.
C3H6O
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C.
C2H4O2
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D.
C3H8
Solution
C2H4O2 (Acetic acid) is a carboxylic acid.
Correct Answer: C — C2H4O2
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Q. Which of the following is a characteristic of adsorption? (2023)
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A.
It is a bulk phenomenon.
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B.
It is a surface phenomenon.
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C.
It occurs at high temperatures only.
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D.
It is always exothermic.
Solution
Adsorption is a surface phenomenon, as it occurs at the interface between phases.
Correct Answer: B — It is a surface phenomenon.
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Q. Which of the following is a characteristic of elastomers?
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A.
Brittle
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B.
Rigid
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C.
Elastic
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D.
Conductive
Solution
Elastomers are known for their elastic properties, allowing them to stretch and return to their original shape.
Correct Answer: C — Elastic
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Q. Which of the following is a characteristic of unsaturated hydrocarbons?
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A.
Only single bonds
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B.
Contains double or triple bonds
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C.
Higher boiling points
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D.
Less reactive
Solution
Unsaturated hydrocarbons contain double or triple bonds, making them more reactive than saturated hydrocarbons.
Correct Answer: B — Contains double or triple bonds
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Q. Which of the following is a characteristic reaction of phenols? (2021) 2021
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A.
Esterification
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B.
Nitration
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C.
Halogenation
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D.
Hydrogenation
Solution
Phenols undergo halogenation readily due to the electron-donating effect of the hydroxyl group.
Correct Answer: C — Halogenation
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Q. Which of the following is a common use of ketones?
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A.
Solvents
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B.
Preservatives
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C.
Fragrances
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D.
All of the above
Solution
Ketones are commonly used as solvents, preservatives, and fragrances.
Correct Answer: D — All of the above
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Q. Which of the following is a common use of PVC?
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A.
Clothing
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B.
Pipes
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C.
Food packaging
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D.
Adhesives
Solution
PVC (Polyvinyl Chloride) is commonly used in the production of pipes due to its durability and resistance to corrosion.
Correct Answer: B — Pipes
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Q. Which of the following is a common use of transition metals?
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A.
Insulators
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B.
Catalysts
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C.
Noble gases
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D.
Non-metals
Solution
Transition metals are commonly used as catalysts in various chemical reactions.
Correct Answer: B — Catalysts
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Q. Which of the following is a lanthanide series element?
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A.
Yttrium
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B.
Neodymium
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C.
Zirconium
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D.
Ruthenium
Solution
Neodymium (Nd) is a member of the lanthanide series.
Correct Answer: B — Neodymium
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Q. Which of the following is a lipid? (2023) 2023
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A.
Starch
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B.
Cholesterol
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C.
Cellulose
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D.
Glucose
Solution
Cholesterol is a type of lipid that is important for cell membrane structure.
Correct Answer: B — Cholesterol
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Q. Which of the following is a polymer of glucose? (2015)
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A.
Starch
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B.
Glycogen
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C.
Cellulose
-
D.
All of the above
Solution
Starch, glycogen, and cellulose are all polymers made from glucose.
Correct Answer: D — All of the above
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Q. Which of the following is a primary alcohol? (2020) 2020
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A.
2-Propanol
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B.
1-Butanol
-
C.
Cyclohexanol
-
D.
2-Pentanol
Solution
1-Butanol has the hydroxyl group (-OH) attached to a primary carbon, making it a primary alcohol.
Correct Answer: B — 1-Butanol
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Q. Which of the following is a primary alcohol? (2022) 2022
-
A.
1-butanol
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B.
2-butanol
-
C.
tert-butanol
-
D.
cyclohexanol
Solution
1-butanol has the hydroxyl group (-OH) attached to a primary carbon atom, making it a primary alcohol.
Correct Answer: A — 1-butanol
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Q. Which of the following is a primary amine? (2022) 2022
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A.
Ethylamine
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B.
Dimethylamine
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C.
Trimethylamine
-
D.
Aniline
Solution
Ethylamine (C2H5NH2) is a primary amine as it has one alkyl group attached to the nitrogen atom.
Correct Answer: A — Ethylamine
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Q. Which of the following is a primary cell? (2023) 2023
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A.
Lead-acid battery
-
B.
Nickel-cadmium battery
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C.
Zinc-carbon battery
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D.
Lithium-ion battery
Solution
The zinc-carbon battery is a type of primary cell, which cannot be recharged.
Correct Answer: C — Zinc-carbon battery
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Q. Which of the following is a property of halogens? (2021) 2021
-
A.
They are all metals
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B.
They have low electronegativity
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C.
They form diatomic molecules
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D.
They are colorless gases
Solution
Halogens exist as diatomic molecules (e.g., Cl2, F2).
Correct Answer: C — They form diatomic molecules
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Q. Which of the following is a reducing agent in the reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O? (2020)
-
A.
MnO4-
-
B.
C2O4^2-
-
C.
H+
-
D.
CO2
Solution
C2O4^2- (oxalate ion) is oxidized to CO2, thus it acts as a reducing agent in this reaction.
Correct Answer: B — C2O4^2-
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Q. Which of the following is a saturated carboxylic acid?
-
A.
Hexanoic acid
-
B.
Hexenoic acid
-
C.
Cyclohexanoic acid
-
D.
Benzoic acid
Solution
Hexanoic acid is a saturated carboxylic acid.
Correct Answer: A — Hexanoic acid
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