Q. Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?
A.
Arsenic
B.
Calcium
C.
Krypton
D.
Titanium
Show solution
Solution
The configuration corresponds to Krypton (Kr), which has 36 electrons.
Correct Answer: C — Krypton
Learn More →
Q. Which enzyme breaks down starch into glucose?
A.
Amylase
B.
Lactase
C.
Sucrase
D.
Cellulase
Show solution
Solution
Amylase is the enzyme that catalyzes the hydrolysis of starch into glucose.
Correct Answer: A — Amylase
Learn More →
Q. Which enzyme is responsible for the hydrolysis of starch?
A.
Amylase
B.
Cellulase
C.
Lactase
D.
Maltase
Show solution
Solution
Amylase is the enzyme that catalyzes the hydrolysis of starch into sugars.
Correct Answer: A — Amylase
Learn More →
Q. Which f-block element is known for its use in nuclear reactors?
A.
Thorium
B.
Cerium
C.
Neodymium
D.
Gadolinium
Show solution
Solution
Thorium (Th) is used in nuclear reactors due to its ability to breed fissile uranium-233.
Correct Answer: A — Thorium
Learn More →
Q. Which factor does NOT affect the Gibbs Free Energy of a reaction?
A.
Temperature
B.
Pressure
C.
Concentration of reactants
D.
Nature of the solvent
Show solution
Solution
The nature of the solvent does not directly affect the Gibbs Free Energy of a reaction; it is primarily influenced by temperature, pressure, and concentration.
Correct Answer: D — Nature of the solvent
Learn More →
Q. Which factor does NOT affect the Gibbs Free Energy of a system?
A.
Temperature
B.
Pressure
C.
Concentration of reactants
D.
Nature of the solvent
Show solution
Solution
While temperature, pressure, and concentration of reactants affect Gibbs Free Energy, the nature of the solvent does not directly affect ΔG.
Correct Answer: D — Nature of the solvent
Learn More →
Q. Which functional group is present in alcohols?
A.
Aldehyde
B.
Hydroxyl
C.
Carboxyl
D.
Amine
Show solution
Solution
Alcohols contain a hydroxyl (-OH) functional group.
Correct Answer: B — Hydroxyl
Learn More →
Q. Which gas has the highest density at the same temperature and pressure?
Show solution
Solution
CO2 has the highest density among the given gases at the same temperature and pressure.
Correct Answer: D — CO2
Learn More →
Q. Which gas has the highest rate of diffusion at a given temperature?
Show solution
Solution
Helium (He) has the highest rate of diffusion due to its low molar mass.
Correct Answer: C — He
Learn More →
Q. Which gas is primarily responsible for the depletion of the ozone layer?
A.
Carbon Dioxide
B.
Chlorofluorocarbons
C.
Methane
D.
Nitrous Oxide
Show solution
Solution
Chlorofluorocarbons (CFCs) are primarily responsible for the depletion of the ozone layer.
Correct Answer: B — Chlorofluorocarbons
Learn More →
Q. Which gas is primarily responsible for the greenhouse effect?
A.
Oxygen
B.
Nitrogen
C.
Carbon Dioxide
D.
Hydrogen
Show solution
Solution
Carbon Dioxide (CO2) is primarily responsible for the greenhouse effect, trapping heat in the atmosphere.
Correct Answer: C — Carbon Dioxide
Learn More →
Q. Which gas is produced during the reaction of an acid with a carbonate?
A.
Oxygen
B.
Hydrogen
C.
Carbon dioxide
D.
Nitrogen
Show solution
Solution
The reaction of an acid with a carbonate produces carbon dioxide gas.
Correct Answer: C — Carbon dioxide
Learn More →
Q. Which gas is produced when an acid reacts with a carbonate?
A.
Oxygen
B.
Carbon dioxide
C.
Hydrogen
D.
Nitrogen
Show solution
Solution
The reaction of an acid with a carbonate produces carbon dioxide gas.
Correct Answer: B — Carbon dioxide
Learn More →
Q. Which gas law relates pressure and temperature at constant volume?
A.
Boyle's Law
B.
Charles's Law
C.
Avogadro's Law
D.
Gay-Lussac's Law
Show solution
Solution
Gay-Lussac's Law relates pressure and temperature at constant volume.
Correct Answer: D — Gay-Lussac's Law
Learn More →
Q. Which gas law relates the volume and temperature of a gas at constant pressure?
A.
Boyle's Law
B.
Charles's Law
C.
Avogadro's Law
D.
Graham's Law
Show solution
Solution
Charles's Law states that the volume of a gas is directly proportional to its temperature at constant pressure.
Correct Answer: B — Charles's Law
Learn More →
Q. Which gas law relates volume and temperature at constant pressure?
A.
Boyle's Law
B.
Charles's Law
C.
Avogadro's Law
D.
Ideal Gas Law
Show solution
Solution
Charles's Law states that the volume of a gas is directly proportional to its temperature at constant pressure.
Correct Answer: B — Charles's Law
Learn More →
Q. Which group of the periodic table contains the alkali metals?
A.
Group 1
B.
Group 2
C.
Group 13
D.
Group 18
Show solution
Solution
Alkali metals are found in Group 1 of the periodic table.
Correct Answer: A — Group 1
Learn More →
Q. Which group of the periodic table contains the halogens?
A.
Group 1
B.
Group 2
C.
Group 17
D.
Group 18
Show solution
Solution
Halogens are located in Group 17 of the periodic table.
Correct Answer: C — Group 17
Learn More →
Q. Which group of the periodic table contains the noble gases?
A.
Group 1
B.
Group 2
C.
Group 17
D.
Group 18
Show solution
Solution
Noble gases are found in Group 18 of the periodic table.
Correct Answer: D — Group 18
Learn More →
Q. Which haloalkane is expected to have the highest boiling point?
A.
CH3Cl
B.
C2H5Cl
C.
C3H7Cl
D.
C4H9Cl
Show solution
Solution
C4H9Cl (butyl chloride) has the highest molecular weight and thus the highest boiling point due to increased van der Waals forces.
Correct Answer: D — C4H9Cl
Learn More →
Q. Which haloalkane is least soluble in water?
A.
Chloroethane
B.
Bromoethane
C.
Iodoethane
D.
Fluoroethane
Show solution
Solution
Iodoethane is least soluble in water due to its larger non-polar iodine atom, which decreases the overall polarity of the molecule.
Correct Answer: C — Iodoethane
Learn More →
Q. Which haloalkane would you expect to have the highest boiling point?
A.
Chloroethane
B.
Bromoethane
C.
Iodoethane
D.
Fluoroethane
Show solution
Solution
Iodoethane has the highest boiling point due to the larger size and greater polarizability of iodine, leading to stronger van der Waals forces.
Correct Answer: C — Iodoethane
Learn More →
Q. Which hybridization corresponds to a tetrahedral molecular geometry?
A.
sp
B.
sp2
C.
sp3
D.
dsp2
Show solution
Solution
sp3 hybridization corresponds to a tetrahedral molecular geometry, as seen in CH4.
Correct Answer: C — sp3
Learn More →
Q. Which is the correct order of adsorption strength from highest to lowest?
A.
Physisorption > Chemisorption
B.
Chemisorption > Physisorption
C.
Physisorption = Chemisorption
D.
None of the above
Show solution
Solution
Chemisorption is stronger than physisorption due to the formation of chemical bonds.
Correct Answer: B — Chemisorption > Physisorption
Learn More →
Q. Which isotope of hydrogen is known as deuterium?
A.
H-1
B.
H-2
C.
H-3
D.
H-4
Show solution
Solution
Deuterium is the isotope of hydrogen with one neutron, denoted as H-2.
Correct Answer: B — H-2
Learn More →
Q. Which isotope of hydrogen is the most abundant?
A.
Deuterium
B.
Tritium
C.
Protium
D.
Hydrogen-3
Show solution
Solution
Protium is the most abundant isotope of hydrogen.
Correct Answer: C — Protium
Learn More →
Q. Which law states that energy cannot be created or destroyed?
A.
Zeroth law
B.
First law
C.
Second law
D.
Third law
Show solution
Solution
The first law of thermodynamics states that energy cannot be created or destroyed, only transformed.
Correct Answer: B — First law
Learn More →
Q. Which law states that the total enthalpy change for a reaction is the same, regardless of the number of steps in the reaction?
A.
First Law of Thermodynamics
B.
Second Law of Thermodynamics
C.
Hess's Law
D.
Gibbs Free Energy
Show solution
Solution
Hess's Law states that the total enthalpy change for a reaction is the same, regardless of the number of steps in the reaction.
Correct Answer: C — Hess's Law
Learn More →
Q. Which law states that the total enthalpy change for a reaction is the same, regardless of the number of steps taken?
A.
First Law of Thermodynamics
B.
Second Law of Thermodynamics
C.
Hess's Law
D.
Gibbs Free Energy
Show solution
Solution
Hess's Law states that the total enthalpy change for a reaction is the same, regardless of the number of steps taken.
Correct Answer: C — Hess's Law
Learn More →
Q. Which law states that the total entropy of an isolated system can never decrease over time?
A.
Zeroth Law
B.
First Law
C.
Second Law
D.
Third Law
Show solution
Solution
The Second Law of Thermodynamics states that the total entropy of an isolated system can never decrease over time.
Correct Answer: C — Second Law
Learn More →
Showing 1681 to 1710 of 2802 (94 Pages)