Chemistry
Q. What is the Ksp of AgCl if the solubility of AgCl in water is 1.33 x 10^-5 M? (2023)
-
A.
1.78 x 10^-10
-
B.
1.33 x 10^-5
-
C.
1.33 x 10^-10
-
D.
1.78 x 10^-5
Solution
Ksp = [Ag+][Cl-] = (1.33 x 10^-5)(1.33 x 10^-5) = 1.78 x 10^-10.
Correct Answer: A — 1.78 x 10^-10
Learn More →
Q. What is the main characteristic of elastomers?
-
A.
Brittle
-
B.
Elastic
-
C.
Rigid
-
D.
Transparent
Solution
Elastomers are characterized by their elastic properties, allowing them to stretch and return to their original shape.
Correct Answer: B — Elastic
Learn More →
Q. What is the main component of natural rubber?
-
A.
Polyisoprene
-
B.
Polystyrene
-
C.
Polyethylene
-
D.
Polyvinyl acetate
Solution
Natural rubber is primarily composed of polyisoprene, which is derived from latex.
Correct Answer: A — Polyisoprene
Learn More →
Q. What is the main function of lipids in the body?
-
A.
Energy storage
-
B.
Genetic information
-
C.
Structural support
-
D.
Transport
Solution
Lipids serve as a major form of energy storage in the body.
Correct Answer: A — Energy storage
Learn More →
Q. What is the main product of the combustion of hydrocarbons? (2023) 2023
-
A.
Oxygen
-
B.
Water
-
C.
Carbon Dioxide
-
D.
Nitrogen
Solution
The main products of the combustion of hydrocarbons are water (H2O) and carbon dioxide (CO2).
Correct Answer: C — Carbon Dioxide
Learn More →
Q. What is the main product of the complete combustion of methane? (2023)
-
A.
Carbon dioxide and water
-
B.
Carbon monoxide and water
-
C.
Carbon and hydrogen
-
D.
Oxygen and water
Solution
The complete combustion of methane (CH4) produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — Carbon dioxide and water
Learn More →
Q. What is the main product of the oxidation of ethanol?
-
A.
Acetic acid
-
B.
Formic acid
-
C.
Butanoic acid
-
D.
Propanoic acid
Solution
The main product of the oxidation of ethanol is acetic acid.
Correct Answer: A — Acetic acid
Learn More →
Q. What is the main product when an amine reacts with an acyl chloride?
-
A.
Amide
-
B.
Ester
-
C.
Alcohol
-
D.
Aldehyde
Solution
The reaction of an amine with an acyl chloride produces an amide.
Correct Answer: A — Amide
Learn More →
Q. What is the main product when an amine reacts with an alkyl halide?
-
A.
Amide
-
B.
Quaternary ammonium salt
-
C.
Alcohol
-
D.
Ester
Solution
The main product is a quaternary ammonium salt when an amine reacts with an alkyl halide, as the amine can be further alkylated.
Correct Answer: B — Quaternary ammonium salt
Learn More →
Q. What is the main product when ethene reacts with bromine?
-
A.
Bromethane
-
B.
1,2-Dibromoethane
-
C.
Ethane
-
D.
Bromoethane
Solution
The reaction of ethene with bromine results in the formation of 1,2-dibromoethane.
Correct Answer: B — 1,2-Dibromoethane
Learn More →
Q. What is the main product when ethene reacts with hydrogen in the presence of a catalyst?
-
A.
Ethane
-
B.
Ethanol
-
C.
Ethyl chloride
-
D.
Acetylene
Solution
The main product is ethane, formed by the hydrogenation of ethene.
Correct Answer: A — Ethane
Learn More →
Q. What is the main product when phenol is treated with bromine?
-
A.
Bromobenzene
-
B.
Bromophenol
-
C.
Benzene
-
D.
Bromobutane
Solution
Bromine reacts with phenol to form bromophenol, which is a substitution product.
Correct Answer: B — Bromophenol
Learn More →
Q. What is the main product when phenol reacts with bromine? (2019)
-
A.
Bromobenzene
-
B.
Bromophenol
-
C.
Benzene
-
D.
No reaction
Solution
Phenol reacts with bromine to form Bromophenol, which is a brominated derivative of phenol.
Correct Answer: B — Bromophenol
Learn More →
Q. What is the main product when phenol reacts with sodium hydroxide?
-
A.
Sodium phenoxide
-
B.
Sodium benzoate
-
C.
Benzene
-
D.
Phenyl acetate
Solution
Phenol reacts with sodium hydroxide to form sodium phenoxide, which is a salt of phenol.
Correct Answer: A — Sodium phenoxide
Learn More →
Q. What is the main product when propan-2-one is treated with iodine in the presence of a base?
-
A.
Iodoform
-
B.
Acetone
-
C.
Bromoform
-
D.
Chloroform
Solution
Propan-2-one (acetone) reacts with iodine in the presence of a base to form Iodoform.
Correct Answer: A — Iodoform
Learn More →
Q. What is the main type of reaction that haloalkanes undergo? (2020)
-
A.
Addition
-
B.
Substitution
-
C.
Elimination
-
D.
Redox
Solution
Haloalkanes primarily undergo nucleophilic substitution reactions due to the presence of a good leaving group (halogen).
Correct Answer: B — Substitution
Learn More →
Q. What is the main use of citric acid?
-
A.
Preservative
-
B.
Flavoring agent
-
C.
Cleaning agent
-
D.
All of the above
Solution
Citric acid is used as a preservative, flavoring agent, and cleaning agent.
Correct Answer: D — All of the above
Learn More →
Q. What is the major product when 2-bromobutane is treated with KOH in ethanol?
-
A.
But-1-ene
-
B.
But-2-ene
-
C.
Butane
-
D.
No reaction
Solution
The major product is But-2-ene due to the more stable double bond formed during elimination.
Correct Answer: B — But-2-ene
Learn More →
Q. What is the mass of 3 moles of NaCl? (2020) 2020
-
A.
87 g
-
B.
58.5 g
-
C.
174 g
-
D.
3 g
Solution
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol. Mass = moles x molar mass = 3 moles x 58.5 g/mol = 174 g.
Correct Answer: C — 174 g
Learn More →
Q. What is the mass of 3 moles of sodium chloride (NaCl)? (2023)
-
A.
58.5 g
-
B.
117 g
-
C.
175.5 g
-
D.
29.25 g
Solution
The molar mass of NaCl is 58.5 g/mol. Therefore, 3 moles of NaCl weigh 3 x 58.5 g = 175.5 g.
Correct Answer: B — 117 g
Learn More →
Q. What is the mass of NaOH required to prepare 0.5 L of a 1 M solution? (2023)
-
A.
20 g
-
B.
40 g
-
C.
10 g
-
D.
30 g
Solution
Molar mass of NaOH = 40 g/mol; grams = moles × molar mass = (1 mole/L × 0.5 L) × 40 g/mol = 20 g
Correct Answer: B — 40 g
Learn More →
Q. What is the mass of solute in grams in a 3 M solution of NaCl in 1 L of solution? (2023)
-
A.
58.44 g
-
B.
174.32 g
-
C.
29.22 g
-
D.
87.16 g
Solution
Molar mass of NaCl = 58.44 g/mol; mass = moles × molar mass = 3 moles × 58.44 g/mol = 175.32 g
Correct Answer: B — 174.32 g
Learn More →
Q. What is the mass of solute in grams required to make 1 L of a 0.1 M solution of NaCl? (Molar mass of NaCl = 58.5 g/mol) (2021)
-
A.
5.85 g
-
B.
10 g
-
C.
1 g
-
D.
2 g
Solution
Mass = moles × molar mass = (0.1 moles/L × 1 L) × 58.5 g/mol = 5.85 g.
Correct Answer: A — 5.85 g
Learn More →
Q. What is the mass of solute in grams required to make 1 L of a 0.5 M NaOH solution? (2021)
-
A.
20 g
-
B.
40 g
-
C.
10 g
-
D.
30 g
Solution
Molar mass of NaOH = 40 g/mol. Mass = moles × molar mass = 0.5 moles × 40 g/mol = 20 g.
Correct Answer: B — 40 g
Learn More →
Q. What is the maximum number of electrons in the d subshell? (2022) 2022
Solution
The d subshell can hold a maximum of 10 electrons.
Correct Answer: C — 10
Learn More →
Q. What is the maximum number of electrons in the f-subshell? (2022)
Solution
The f-subshell can hold a maximum of 14 electrons.
Correct Answer: C — 14
Learn More →
Q. What is the maximum number of electrons that can occupy the n=3 shell? (2021) 2021
Solution
The maximum number of electrons in a shell is given by the formula 2n². For n=3, it is 2(3)² = 18.
Correct Answer: C — 18
Learn More →
Q. What is the maximum number of electrons that can occupy the n=3 shell? (2022) 2022
Solution
The maximum number of electrons in a shell is given by the formula 2n². For n=3, it is 2(3)² = 18.
Correct Answer: C — 18
Learn More →
Q. What is the maximum oxidation state of phosphorus in its compounds? (2021)
Solution
Phosphorus can exhibit a maximum oxidation state of +5 in compounds like PCl5.
Correct Answer: B — +5
Learn More →
Q. What is the molality of a solution made by dissolving 10 moles of solute in 5 kg of solvent? (2022)
-
A.
2 m
-
B.
1 m
-
C.
0.5 m
-
D.
3 m
Solution
Molality (m) = moles of solute / kg of solvent = 10 moles / 5 kg = 2 m.
Correct Answer: A — 2 m
Learn More →
Showing 181 to 210 of 533 (18 Pages)