Chemistry (School & UG)
Q. What is the principal quantum number for the outermost electrons in a chlorine atom?
Show solution
Solution
Chlorine has an atomic number of 17, and its outermost electrons are in the n=3 shell.
Correct Answer: C — 3
Learn More →
Q. What is the principal quantum number for the outermost electrons in a potassium atom?
Show solution
Solution
Potassium (K) has an atomic number of 19, and its outermost electrons are in the n=4 level.
Correct Answer: C — 3
Learn More →
Q. What is the principal quantum number for the outermost electrons in a sodium atom?
Show solution
Solution
Sodium has an electron configuration of 1s2 2s2 2p6 3s1, so the principal quantum number is 3.
Correct Answer: C — 3
Learn More →
Q. What is the principal quantum number for the outermost electrons in potassium (K)?
Show solution
Solution
Potassium has an atomic number of 19, and its outermost electrons are in the 4th shell (n=4).
Correct Answer: B — 4
Learn More →
Q. What is the principal quantum number for the outermost electrons in sodium (Na)?
Show solution
Solution
Sodium has an atomic number of 11, and its outermost electrons are in the n=3 energy level.
Correct Answer: C — 3
Learn More →
Q. What is the principal quantum number of the outermost electrons in a chlorine atom?
Show solution
Solution
Chlorine has an atomic number of 17, and its outermost electrons are in the 3rd shell (n=3).
Correct Answer: B — 3
Learn More →
Q. What is the principle behind electrophoresis in qualitative analysis?
A.
Separation based on boiling point
B.
Separation based on charge and size
C.
Separation based on solubility
D.
Separation based on density
Show solution
Solution
Electrophoresis separates charged particles based on their size and charge when an electric field is applied.
Correct Answer: B — Separation based on charge and size
Learn More →
Q. What is the principle behind quantum mechanics in chemistry?
A.
Particles have wave-like properties
B.
Energy is quantized
C.
Both A and B
D.
None of the above
Show solution
Solution
Quantum mechanics in chemistry is based on the principles that particles exhibit wave-like properties and that energy is quantized.
Correct Answer: C — Both A and B
Learn More →
Q. What is the principle behind the use of chromatography for qualitative analysis?
A.
Separation based on charge
B.
Separation based on size
C.
Separation based on solubility
D.
Separation based on boiling point
Show solution
Solution
Chromatography separates components based on their solubility in the mobile phase relative to the stationary phase.
Correct Answer: C — Separation based on solubility
Learn More →
Q. What is the principle behind using UV-Vis spectroscopy for qualitative analysis?
A.
It measures the mass of ions
B.
It detects the color of the solution
C.
It identifies functional groups based on absorbance
D.
It separates ions based on charge
Show solution
Solution
UV-Vis spectroscopy identifies compounds by measuring the absorbance of light at specific wavelengths, which correlates with functional groups.
Correct Answer: C — It identifies functional groups based on absorbance
Learn More →
Q. What is the product of the complete combustion of 2-butyne?
A.
C4H10 + CO2 + H2O
B.
C4H10 + CO + H2O
C.
CO2 + H2O
D.
C4H8 + O2
Show solution
Solution
The complete combustion of 2-butyne produces carbon dioxide (CO2) and water (H2O).
Correct Answer: C — CO2 + H2O
Learn More →
Q. What is the product of the complete combustion of ethyne (acetylene)?
A.
CO2 and H2O
B.
C and H2O
C.
CO and H2O
D.
C2H4
Show solution
Solution
The complete combustion of ethyne produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — CO2 and H2O
Learn More →
Q. What is the product of the complete combustion of ethyne (C2H2)?
A.
C2H4 + H2O
B.
CO2 + H2O
C.
C2H6 + O2
D.
C2H2 + O2
Show solution
Solution
The complete combustion of ethyne produces carbon dioxide (CO2) and water (H2O).
Correct Answer: B — CO2 + H2O
Learn More →
Q. What is the product of the dehydration of an alcohol?
A.
Alkene
B.
Alkane
C.
Ether
D.
Aldehyde
Show solution
Solution
The dehydration of an alcohol typically results in the formation of an alkene.
Correct Answer: A — Alkene
Learn More →
Q. What is the product of the E1 elimination of 2-bromo-2-methylpropane?
A.
Isobutylene
B.
Butane
C.
2-methylpropene
D.
Cyclobutane
Show solution
Solution
E1 elimination of 2-bromo-2-methylpropane leads to the formation of 2-methylpropene as the major product.
Correct Answer: C — 2-methylpropene
Learn More →
Q. What is the product of the E2 elimination of 2-bromobutane?
A.
Butene
B.
2-butene
C.
1-butene
D.
Butyne
Show solution
Solution
The E2 elimination of 2-bromobutane primarily yields 2-butene as the product due to the formation of a double bond between the second and third carbons.
Correct Answer: B — 2-butene
Learn More →
Q. What is the product of the electrophilic substitution of toluene with sulfuric acid?
A.
Toluene sulfonic acid
B.
Benzene sulfonic acid
C.
Methyl sulfonic acid
D.
Phenol
Show solution
Solution
The product is toluene sulfonic acid, formed when toluene reacts with sulfuric acid in an electrophilic substitution reaction.
Correct Answer: A — Toluene sulfonic acid
Learn More →
Q. What is the product of the elimination reaction of 2-bromobutane with KOH in ethanol?
A.
But-1-ene
B.
But-2-ene
C.
But-3-ene
D.
Butane
Show solution
Solution
The major product is but-2-ene due to the formation of the more stable alkene through elimination.
Correct Answer: B — But-2-ene
Learn More →
Q. What is the product of the Friedel-Crafts acylation of benzene with acetyl chloride?
A.
Acetophenone
B.
Benzophenone
C.
Benzyl acetate
D.
Phenyl acetate
Show solution
Solution
The product of the Friedel-Crafts acylation of benzene with acetyl chloride is acetophenone, where an acyl group is introduced to the benzene ring.
Correct Answer: A — Acetophenone
Learn More →
Q. What is the product of the Friedel-Crafts acylation of benzene with acetyl chloride (CH3COCl)?
A.
Acetophenone
B.
Benzophenone
C.
Benzyl acetate
D.
Phenyl acetate
Show solution
Solution
The product is acetophenone, formed when benzene reacts with acetyl chloride in the presence of a Lewis acid catalyst.
Correct Answer: A — Acetophenone
Learn More →
Q. What is the product of the Friedel-Crafts acylation of benzene with acetyl chloride (CH3COCl) in the presence of AlCl3?
A.
Acetophenone
B.
Benzophenone
C.
Benzyl acetate
D.
Phenyl acetate
Show solution
Solution
The product of the Friedel-Crafts acylation of benzene with acetyl chloride is acetophenone, formed by the introduction of the acetyl group onto the benzene ring.
Correct Answer: A — Acetophenone
Learn More →
Q. What is the product of the Friedel-Crafts acylation of benzene with acetyl chloride in the presence of AlCl3?
A.
Acetophenone
B.
Benzophenone
C.
Benzyl acetate
D.
Phenyl acetate
Show solution
Solution
The product is acetophenone, formed by the acylation of benzene with acetyl chloride.
Correct Answer: A — Acetophenone
Learn More →
Q. What is the product of the Friedel-Crafts alkylation of benzene with 1-bromopropane in the presence of AlCl3?
A.
Propylbenzene
B.
Isopropylbenzene
C.
Benzyl bromide
D.
Benzene
Show solution
Solution
The product is propylbenzene, formed when benzene reacts with 1-bromopropane in the presence of AlCl3, which generates a propyl cation.
Correct Answer: A — Propylbenzene
Learn More →
Q. What is the product of the hydrogenation of 1-hexene?
A.
Hexane
B.
Cyclohexane
C.
1-hexanol
D.
2-hexanol
Show solution
Solution
Hydrogenation of 1-hexene adds hydrogen across the double bond, resulting in hexane.
Correct Answer: A — Hexane
Learn More →
Q. What is the product of the hydrogenation of 2-pentyne?
A.
pentane
B.
2-pentene
C.
1-pentene
D.
3-pentene
Show solution
Solution
The hydrogenation of 2-pentyne will fully saturate the triple bond, resulting in pentane.
Correct Answer: A — pentane
Learn More →
Q. What is the product of the hydrolysis of an amide?
A.
Carboxylic acid and amine
B.
Alcohol and acid
C.
Alkene and water
D.
Ketone and ammonia
Show solution
Solution
The hydrolysis of an amide yields a carboxylic acid and an amine, typically in the presence of water and an acid or base.
Correct Answer: A — Carboxylic acid and amine
Learn More →
Q. What is the product of the hydrolysis of an ester?
A.
Alcohol and carboxylic acid
B.
Alkene and water
C.
Ketone and hydrogen
D.
Aldehyde and carbon dioxide
Show solution
Solution
The hydrolysis of an ester yields an alcohol and a carboxylic acid.
Correct Answer: A — Alcohol and carboxylic acid
Learn More →
Q. What is the product of the hydrolysis of chlorobenzene?
A.
Phenol
B.
Benzene
C.
Chlorobenzene
D.
Benzyl alcohol
Show solution
Solution
The hydrolysis of chlorobenzene primarily yields phenol, as the chlorine atom is replaced by a hydroxyl group.
Correct Answer: A — Phenol
Learn More →
Q. What is the product of the reaction between 1-butyne and H2 in the presence of a catalyst?
A.
1-butene
B.
2-butene
C.
Butane
D.
Cyclobutane
Show solution
Solution
The hydrogenation of 1-butyne with H2 in the presence of a catalyst results in the formation of butane.
Correct Answer: C — Butane
Learn More →
Q. What is the product of the reaction between 1-pentene and HBr?
A.
1-bromopentane
B.
2-bromopentane
C.
3-bromopentane
D.
4-bromopentane
Show solution
Solution
The reaction follows Markovnikov's rule, leading to the formation of 2-bromopentane as the major product.
Correct Answer: B — 2-bromopentane
Learn More →
Showing 991 to 1020 of 1878 (63 Pages)