Q. What is the main product when hydrogen reacts with nitrogen at high temperatures?
-
A.
Ammonia
-
B.
Hydrazine
-
C.
Nitric oxide
-
D.
Nitrogen gas
Solution
The main product of the reaction between hydrogen and nitrogen at high temperatures is ammonia (NH3).
Correct Answer: A — Ammonia
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Q. What is the main product when phenol is treated with bromine water?
-
A.
Bromobenzene
-
B.
2,4,6-Tribromophenol
-
C.
Bromophenol
-
D.
Benzene
Solution
Phenol reacts with bromine water to form 2,4,6-tribromophenol, a white precipitate.
Correct Answer: B — 2,4,6-Tribromophenol
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Q. What is the main product when phenol is treated with zinc dust?
-
A.
Benzene
-
B.
Cyclohexanol
-
C.
Toluene
-
D.
Phenyl ether
Solution
Zinc dust reduces phenol to benzene.
Correct Answer: A — Benzene
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Q. What is the main product when phenol reacts with bromine water?
-
A.
Bromobenzene
-
B.
2,4,6-tribromophenol
-
C.
Bromophenol
-
D.
Benzene
Solution
Phenol reacts with bromine water to form 2,4,6-tribromophenol, a white precipitate.
Correct Answer: B — 2,4,6-tribromophenol
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Q. What is the main product when phenol reacts with concentrated sulfuric acid?
-
A.
Phenyl sulfate
-
B.
Benzene
-
C.
Catechol
-
D.
Anisole
Solution
The main product is phenyl sulfate, formed by the electrophilic substitution of the hydroxyl group.
Correct Answer: A — Phenyl sulfate
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Q. What is the main product when propan-2-one is treated with sodium bisulfite?
-
A.
Sodium propan-2-one sulfonate
-
B.
Propan-2-ol
-
C.
Propan-2-one bisulfite adduct
-
D.
None of the above
Solution
The main product is the propan-2-one bisulfite adduct.
Correct Answer: C — Propan-2-one bisulfite adduct
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Q. What is the main product when propanal is treated with excess alcohol in the presence of an acid catalyst?
-
A.
Aldol
-
B.
Acetal
-
C.
Ketone
-
D.
Carboxylic acid
Solution
When propanal is treated with excess alcohol in the presence of an acid catalyst, an acetal is formed.
Correct Answer: B — Acetal
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Q. What is the main product when propanal is treated with excess Grignard reagent followed by hydrolysis?
-
A.
Propan-1-ol
-
B.
Propan-2-ol
-
C.
Propan-1,2-diol
-
D.
Butan-2-ol
Solution
The reaction of propanal with excess Grignard reagent followed by hydrolysis yields propan-2-ol.
Correct Answer: B — Propan-2-ol
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Q. What is the main product when propanal is treated with excess hydrogen in the presence of a catalyst?
-
A.
Propan-1-ol
-
B.
Propan-2-ol
-
C.
Propanoic acid
-
D.
Propane
Solution
Propanal is reduced to propan-1-ol when treated with excess hydrogen in the presence of a catalyst.
Correct Answer: A — Propan-1-ol
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Q. What is the main product when propanoic acid is treated with thionyl chloride?
-
A.
Propyl chloride
-
B.
Propanoic anhydride
-
C.
Propionyl chloride
-
D.
Propylene
Solution
The reaction of propanoic acid with thionyl chloride produces propionyl chloride.
Correct Answer: C — Propionyl chloride
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Q. What is the main product when propene is reacted with hydrogen in the presence of a catalyst?
-
A.
Propane
-
B.
Butane
-
C.
Ethane
-
D.
Cyclopropane
Solution
The main product of the hydrogenation of propene is propane.
Correct Answer: A — Propane
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Q. What is the main product when propene undergoes hydroboration-oxidation?
-
A.
Propan-1-ol
-
B.
Propan-2-ol
-
C.
Propanoic acid
-
D.
Butanol
Solution
The main product of hydroboration-oxidation of propene is propan-2-ol.
Correct Answer: B — Propan-2-ol
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Q. What is the main product when toluene is nitrated?
-
A.
Nitrotoluene
-
B.
Dinitrotoluene
-
C.
Benzaldehyde
-
D.
Benzyl alcohol
Solution
Nitration of toluene primarily yields nitrotoluene, with the nitro group being directed to the ortho and para positions.
Correct Answer: A — Nitrotoluene
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Q. What is the main purpose of emulsifiers in food products?
-
A.
Thicken
-
B.
Stabilize mixtures
-
C.
Add flavor
-
D.
Preserve freshness
Solution
Emulsifiers stabilize mixtures of oil and water, preventing separation in food products.
Correct Answer: B — Stabilize mixtures
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Q. What is the main purpose of using antioxidants in food?
-
A.
Enhance color
-
B.
Prevent oxidation
-
C.
Improve taste
-
D.
Increase shelf life
Solution
Antioxidants are used to prevent oxidation, which can lead to spoilage and loss of quality.
Correct Answer: B — Prevent oxidation
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Q. What is the main purpose of using baking soda in cooking?
-
A.
Flavoring
-
B.
Leavening
-
C.
Preserving
-
D.
Coloring
Solution
Baking soda acts as a leavening agent, helping baked goods to rise.
Correct Answer: B — Leavening
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Q. What is the main purpose of using fluoride in dental care?
-
A.
Whiten teeth
-
B.
Prevent cavities
-
C.
Freshen breath
-
D.
Strengthen gums
Solution
Fluoride is used in dental care to help prevent cavities and strengthen tooth enamel.
Correct Answer: B — Prevent cavities
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Q. What is the main reaction type when alcohols are converted to alkyl halides?
-
A.
Substitution
-
B.
Elimination
-
C.
Addition
-
D.
Redox
Solution
The conversion of alcohols to alkyl halides typically involves a nucleophilic substitution reaction.
Correct Answer: A — Substitution
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Q. What is the main reason for the appearance of a diffraction pattern when light passes through a narrow slit?
-
A.
Interference of light waves
-
B.
Refraction of light
-
C.
Absorption of light
-
D.
Reflection of light
Solution
The diffraction pattern arises due to the interference of light waves that spread out after passing through the slit.
Correct Answer: A — Interference of light waves
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Q. What is the main reason for the existence of geometric isomers?
-
A.
Presence of double bonds
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B.
Presence of single bonds
-
C.
Presence of chiral centers
-
D.
Presence of functional groups
Solution
Geometric isomers arise due to restricted rotation around double bonds.
Correct Answer: A — Presence of double bonds
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Q. What is the main reason for the stability of aromatic compounds?
-
A.
High molecular weight
-
B.
Presence of double bonds
-
C.
Resonance energy
-
D.
Hydrogen bonding
Solution
The stability of aromatic compounds is primarily due to resonance energy, which arises from the delocalization of pi electrons across the ring.
Correct Answer: C — Resonance energy
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Q. What is the main reason for the stability of atomic nuclei?
-
A.
Electromagnetic force
-
B.
Gravitational force
-
C.
Strong nuclear force
-
D.
Weak nuclear force
Solution
The stability of atomic nuclei is primarily due to the strong nuclear force, which binds protons and neutrons together.
Correct Answer: C — Strong nuclear force
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Q. What is the main reason for the stability of benzene?
-
A.
Presence of double bonds
-
B.
Resonance
-
C.
Hydrogen bonding
-
D.
Ionic interactions
Solution
The stability of benzene arises from resonance, where the electrons are delocalized over the ring structure, lowering the overall energy.
Correct Answer: B — Resonance
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Q. What is the main reason for the stability of the electron orbits in an atom?
-
A.
Centripetal force
-
B.
Electrostatic force
-
C.
Quantum mechanics
-
D.
All of the above
Solution
The stability of the electron orbits in an atom is primarily explained by quantum mechanics.
Correct Answer: C — Quantum mechanics
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Q. What is the main reason for the stability of the nucleus in an atom?
-
A.
Electromagnetic force
-
B.
Gravitational force
-
C.
Strong nuclear force
-
D.
Weak nuclear force
Solution
The stability of the nucleus is primarily due to the strong nuclear force, which binds protons and neutrons together.
Correct Answer: C — Strong nuclear force
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Q. What is the main reason for the stability of the nucleus?
-
A.
Electromagnetic force
-
B.
Gravitational force
-
C.
Strong nuclear force
-
D.
Weak nuclear force
Solution
The stability of the nucleus is primarily due to the strong nuclear force, which binds protons and neutrons together.
Correct Answer: C — Strong nuclear force
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Q. What is the main reason that gases have low density compared to solids and liquids?
-
A.
High temperature
-
B.
Low pressure
-
C.
Large particle separation
-
D.
High kinetic energy
Solution
Gases have low density because their particles are far apart, leading to a larger volume for the same mass.
Correct Answer: C — Large particle separation
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Q. What is the main source of alkanes?
-
A.
Coal
-
B.
Natural gas
-
C.
Petroleum
-
D.
Biomass
Solution
The main source of alkanes is petroleum, which contains a mixture of hydrocarbons.
Correct Answer: C — Petroleum
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Q. What is the main source of nitrogen oxides in the atmosphere?
-
A.
Volcanic eruptions
-
B.
Vehicle emissions
-
C.
Industrial processes
-
D.
Agricultural activities
Solution
Vehicle emissions are the main source of nitrogen oxides (NOx) in the atmosphere.
Correct Answer: B — Vehicle emissions
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Q. What is the main source of sulfur dioxide in the atmosphere?
-
A.
Volcanic eruptions
-
B.
Automobile emissions
-
C.
Industrial processes
-
D.
All of the above
Solution
Sulfur dioxide is released from various sources including volcanic eruptions, automobile emissions, and industrial processes.
Correct Answer: D — All of the above
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