Chemistry (School & UG)
Q. What is the product of the reaction between a strong acid and a strong base?
A.
Salt
B.
Water
C.
Hydrogen gas
D.
Both Salt and Water
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Solution
The reaction between a strong acid and a strong base produces both salt and water.
Correct Answer: D — Both Salt and Water
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Q. What is the product of the reaction between an acid and a base?
A.
Salt and water
B.
Hydrogen gas
C.
Carbon dioxide
D.
Oxygen gas
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Solution
The reaction between an acid and a base produces salt and water, known as a neutralization reaction.
Correct Answer: A — Salt and water
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Q. What is the product of the reaction between an acid and a carbonate?
A.
Salt
B.
Water
C.
Carbon dioxide
D.
All of the above
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Solution
The reaction between an acid and a carbonate produces a salt, water, and carbon dioxide.
Correct Answer: D — All of the above
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Q. What is the product of the reaction between an alcohol and a carboxylic acid in the presence of an acid catalyst?
A.
Ester
B.
Ether
C.
Aldehyde
D.
Ketone
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Solution
The reaction between an alcohol and a carboxylic acid in the presence of an acid catalyst produces an ester through a process called esterification.
Correct Answer: A — Ester
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Q. What is the product of the reaction between an amine and an alkyl halide?
A.
Amide
B.
Quaternary ammonium salt
C.
Nitrile
D.
Alcohol
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Solution
The reaction between an amine and an alkyl halide typically produces a quaternary ammonium salt.
Correct Answer: B — Quaternary ammonium salt
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Q. What is the product of the reaction between benzene and sulfur trioxide in the presence of sulfuric acid?
A.
Benzene sulfonic acid
B.
Benzene thiol
C.
Benzyl sulfonate
D.
Benzene sulfide
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Solution
The reaction produces benzene sulfonic acid, where a sulfonyl group is introduced onto the benzene ring.
Correct Answer: A — Benzene sulfonic acid
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Q. What is the product of the reaction between benzyl chloride and sodium hydroxide in water?
A.
Benzyl alcohol
B.
Benzyl ether
C.
Benzyl amine
D.
Benzyl bromide
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Solution
The reaction proceeds via an SN2 mechanism, resulting in the formation of benzyl alcohol.
Correct Answer: A — Benzyl alcohol
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Q. What is the product of the reaction between ethene and bromine?
A.
Bromoethane
B.
1,2-Dibromoethane
C.
Ethane
D.
Ethyl bromide
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Solution
The reaction between ethene and bromine results in the formation of 1,2-dibromoethane through an electrophilic addition mechanism.
Correct Answer: B — 1,2-Dibromoethane
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Q. What is the product of the reaction between ethene and HBr?
A.
Bromoethane
B.
Ethyl bromide
C.
1-bromopropane
D.
2-bromopropane
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Solution
The addition of HBr to ethene results in the formation of bromoethane through an electrophilic addition mechanism.
Correct Answer: A — Bromoethane
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Q. What is the product of the reaction between ethene and water in the presence of an acid catalyst?
A.
Ethanol
B.
Ethane
C.
Ethylene glycol
D.
Acetic acid
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Solution
The reaction of ethene with water in the presence of an acid catalyst leads to the formation of ethanol through hydration.
Correct Answer: A — Ethanol
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Q. What is the product of the reaction between propene and HBr?
A.
1-bromopropane
B.
2-bromopropane
C.
Propyl bromide
D.
Bromopropane
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Solution
The addition of HBr to propene follows Markovnikov's rule, leading to the formation of 2-bromopropane as the major product.
Correct Answer: B — 2-bromopropane
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Q. What is the product of the reaction of 1-chloropropane with potassium thiocyanate?
A.
propyl thiocyanate
B.
propyl isothiocyanate
C.
1-thiocyanatopropane
D.
no reaction
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Solution
The reaction produces propyl thiocyanate through an SN2 mechanism, where the thiocyanate ion acts as a nucleophile.
Correct Answer: A — propyl thiocyanate
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Q. What is the product of the reaction of 1-pentyne with H2 in the presence of Lindlar's catalyst?
A.
Pentane
B.
1-pentene
C.
2-pentene
D.
1-butyne
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Solution
Lindlar's catalyst selectively hydrogenates alkynes to alkenes, resulting in the formation of cis-2-pentene from 1-pentyne.
Correct Answer: C — 2-pentene
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Q. What is the product of the reaction of 2-pentyne with water in the presence of sulfuric acid?
A.
2-Pentanol
B.
3-Pentanol
C.
Pentanal
D.
Pentanoic acid
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Solution
The hydration of 2-pentyne in the presence of sulfuric acid leads to the formation of 3-pentanol.
Correct Answer: B — 3-Pentanol
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Q. What is the product of the reaction of an amine with nitrous acid?
A.
Diazonium salt
B.
Amide
C.
Alcohol
D.
Aldehyde
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Solution
The reaction of an amine with nitrous acid produces a diazonium salt.
Correct Answer: A — Diazonium salt
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Q. What is the product of the reaction of benzene with bromine in the presence of a Lewis acid catalyst?
A.
Bromobenzene
B.
Benzyl bromide
C.
Bromobenzyl
D.
Benzene dibromide
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Solution
The reaction of benzene with bromine in the presence of a Lewis acid catalyst leads to the substitution of a hydrogen atom with a bromine atom, forming bromobenzene.
Correct Answer: A — Bromobenzene
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Q. What is the product of the reaction of benzene with bromine in the presence of FeBr3?
A.
Bromobenzene
B.
Benzyl bromide
C.
Bromopropane
D.
No reaction
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Solution
The product is Bromobenzene, as the reaction involves electrophilic aromatic substitution.
Correct Answer: A — Bromobenzene
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Q. What is the product of the reaction of benzene with sulfur trioxide (SO3) in the presence of sulfuric acid?
A.
Benzene sulfonic acid
B.
Benzene thiol
C.
Benzene sulfide
D.
Benzene sulfoxide
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Solution
The product is benzene sulfonic acid, formed by the electrophilic substitution of sulfur trioxide on the benzene ring.
Correct Answer: A — Benzene sulfonic acid
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Q. What is the product of the reaction of ethylene with bromine?
A.
Bromomethane
B.
1,2-dibromoethane
C.
Bromoethane
D.
Ethane
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Solution
The reaction of ethylene (an alkene) with bromine results in the formation of 1,2-dibromoethane through an electrophilic addition mechanism.
Correct Answer: B — 1,2-dibromoethane
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Q. What is the product of the reaction of phenol with acetic anhydride?
A.
Phenyl acetate
B.
Acetophenone
C.
Benzyl acetate
D.
Phenyl acetic acid
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Solution
The reaction of phenol with acetic anhydride produces phenyl acetate through an acetylation reaction.
Correct Answer: A — Phenyl acetate
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Q. What is the product of the reaction of phenol with excess bromine?
A.
Bromobenzene
B.
2,4,6-Tribromophenol
C.
Bromophenol
D.
Benzene
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Solution
The product is 2,4,6-tribromophenol, as phenol is highly reactive towards electrophilic substitution and can undergo multiple brominations.
Correct Answer: B — 2,4,6-Tribromophenol
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Q. What is the product of the sulfonation of benzene using sulfur trioxide (SO3)?
A.
Benzene sulfonic acid
B.
Benzene thiol
C.
Benzene sulfonate
D.
Benzene disulfonic acid
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Solution
The product is benzene sulfonic acid, formed by the electrophilic substitution of sulfur trioxide on benzene.
Correct Answer: A — Benzene sulfonic acid
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Q. What is the purpose of a back titration?
A.
To determine the concentration of a reactant indirectly
B.
To measure the temperature of a solution
C.
To identify the solubility of a compound
D.
To calculate the pH of a solution
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Solution
Back titration is used to determine the concentration of a reactant indirectly by reacting it with an excess of titrant and then titrating the excess.
Correct Answer: A — To determine the concentration of a reactant indirectly
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Q. What is the purpose of a salt bridge in a galvanic cell?
A.
To connect the electrodes
B.
To maintain charge balance
C.
To increase voltage
D.
To decrease resistance
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Solution
The salt bridge maintains charge balance by allowing ions to flow between the two half-cells.
Correct Answer: B — To maintain charge balance
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Q. What is the purpose of a salt bridge in an electrochemical cell?
A.
To connect electrodes
B.
To maintain charge balance
C.
To increase voltage
D.
To decrease resistance
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Solution
The salt bridge maintains charge balance by allowing ions to flow between the two half-cells.
Correct Answer: B — To maintain charge balance
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Q. What is the purpose of a standard solution in titration?
A.
To provide a known concentration for comparison
B.
To dilute the analyte solution
C.
To act as a solvent
D.
To change the color of the solution
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Solution
A standard solution is used in titration to provide a known concentration that allows for accurate calculations of the analyte's concentration.
Correct Answer: A — To provide a known concentration for comparison
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Q. What is the purpose of a titration in analytical chemistry?
A.
To separate components of a mixture
B.
To determine the concentration of a solution
C.
To measure the absorbance of a solution
D.
To identify the molecular weight of a compound
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Solution
Titration is used to determine the concentration of a solution by reacting it with a solution of known concentration.
Correct Answer: B — To determine the concentration of a solution
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Q. What is the purpose of a titration in qualitative analysis?
A.
To determine the molecular weight of a compound
B.
To identify the endpoint of a reaction
C.
To measure the boiling point of a solution
D.
To separate components of a mixture
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Solution
Titration is used to identify the endpoint of a reaction, which can indicate the presence of specific ions.
Correct Answer: B — To identify the endpoint of a reaction
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Q. What is the purpose of using a blank in UV-Vis spectroscopy?
A.
To calibrate the instrument
B.
To measure the sample concentration
C.
To account for solvent absorbance
D.
To enhance signal detection
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Solution
A blank is used to account for the absorbance of the solvent, ensuring that only the sample's absorbance is measured.
Correct Answer: C — To account for solvent absorbance
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Q. What is the purpose of using a blank sample in UV-Vis spectroscopy?
A.
To calibrate the instrument
B.
To increase the sensitivity of the measurement
C.
To provide a reference for baseline correction
D.
To enhance the sample's absorbance
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Solution
A blank sample is used to provide a reference for baseline correction, ensuring that only the absorbance due to the analyte is measured.
Correct Answer: C — To provide a reference for baseline correction
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