Q. What is the pH of a solution that has a hydronium ion concentration of 1 x 10^-5 M?
Show solution
Solution
pH is calculated as pH = -log[H3O+]. For [H3O+] = 1 x 10^-5 M, pH = -log(1 x 10^-5) = 5.
Correct Answer: A — 5
Learn More →
Q. What is the pH of a solution that has a hydroxide ion concentration of 1.0 x 10^-3 M?
Show solution
Solution
pOH = -log[OH-] = -log(1.0 x 10^-3) = 3. Therefore, pH = 14 - pOH = 14 - 3 = 11.
Correct Answer: A — 11
Learn More →
Q. What is the pH of a solution that has a [H+] concentration of 1 x 10^-7 M?
Show solution
Solution
pH = -log[H+] = -log(1 x 10^-7) = 7.
Correct Answer: A — 7
Learn More →
Q. What is the pH of a solution that is 0.1 M in both acetic acid and sodium acetate?
A.
4.76
B.
5.76
C.
6.76
D.
7.76
Show solution
Solution
Using Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]); pKa of acetic acid = 4.76, so pH = 4.76 + log(1) = 4.76
Correct Answer: A — 4.76
Learn More →
Q. What is the pH of a solution with a hydroxide ion concentration of 0.001 M?
Show solution
Solution
pOH = -log[OH-] = -log(0.001) = 3; pH = 14 - pOH = 14 - 3 = 11
Correct Answer: B — 12
Learn More →
Q. What is the pH of a solution with a hydroxide ion concentration of 1.0 x 10^-4 M?
Show solution
Solution
To find the pH, first calculate pOH = -log[OH-] = 4, then use pH + pOH = 14, so pH = 14 - 4 = 10.
Correct Answer: A — 10
Learn More →
Q. What is the pH of a solution with [H+] = 1 x 10^-6 M?
Show solution
Solution
Using the formula pH = -log[H+], we find pH = -log(1 x 10^-6) = 6.
Correct Answer: A — 6
Learn More →
Q. What is the phenomenon called when a liquid changes to gas at a temperature below its boiling point?
A.
Evaporation
B.
Condensation
C.
Sublimation
D.
Freezing
Show solution
Solution
Evaporation is the process where a liquid changes to gas at temperatures below its boiling point.
Correct Answer: A — Evaporation
Learn More →
Q. What is the phenomenon called when a liquid changes to gas at temperatures below its boiling point?
A.
Evaporation
B.
Condensation
C.
Sublimation
D.
Vaporization
Show solution
Solution
Evaporation is the process where a liquid changes to gas at temperatures below its boiling point.
Correct Answer: A — Evaporation
Learn More →
Q. What is the phenomenon called when a liquid rises in a narrow tube against gravity?
A.
Capillarity
B.
Viscosity
C.
Surface tension
D.
Hydrostatic pressure
Show solution
Solution
Capillarity is the phenomenon where a liquid rises in a narrow tube against gravity due to adhesive and cohesive forces.
Correct Answer: A — Capillarity
Learn More →
Q. What is the primary characteristic of liquids that distinguishes them from solids?
A.
Definite shape
B.
Definite volume
C.
Incompressibility
D.
Fluidity
Show solution
Solution
Liquids have fluidity, allowing them to flow and take the shape of their container.
Correct Answer: D — Fluidity
Learn More →
Q. What is the primary driving force for adsorption in physisorption?
A.
Chemical bonds
B.
Van der Waals forces
C.
Hydrogen bonds
D.
Ionic interactions
Show solution
Solution
Physisorption is primarily driven by weak van der Waals forces.
Correct Answer: B — Van der Waals forces
Learn More →
Q. What is the primary factor affecting colligative properties?
A.
Nature of solute
B.
Concentration of solute
C.
Temperature
D.
Volume of solvent
Show solution
Solution
Colligative properties depend primarily on the concentration of solute particles in a solution.
Correct Answer: B — Concentration of solute
Learn More →
Q. What is the primary factor that affects the rate of a chemical reaction?
A.
Concentration
B.
Temperature
C.
Catalyst
D.
All of the above
Show solution
Solution
All of the above factors affect the rate of a chemical reaction.
Correct Answer: D — All of the above
Learn More →
Q. What is the primary factor that affects the rate of adsorption of a gas on a solid surface?
A.
Temperature
B.
Pressure
C.
Surface area of the adsorbent
D.
Nature of the gas
Show solution
Solution
The rate of adsorption is primarily affected by the surface area of the adsorbent, as a larger surface area provides more sites for adsorption.
Correct Answer: C — Surface area of the adsorbent
Learn More →
Q. What is the primary factor that affects the state of matter of a substance?
A.
Temperature
B.
Color
C.
Mass
D.
Volume
Show solution
Solution
Temperature is the primary factor that affects the state of matter by influencing kinetic energy.
Correct Answer: A — Temperature
Learn More →
Q. What is the primary function of a cathode in an electrochemical cell?
A.
To oxidize species
B.
To reduce species
C.
To provide electrons
D.
To balance charge
Show solution
Solution
The cathode is where reduction occurs, gaining electrons in the process.
Correct Answer: B — To reduce species
Learn More →
Q. What is the primary function of a salt bridge in a galvanic cell?
A.
To provide a path for electrons
B.
To maintain charge balance
C.
To increase voltage
D.
To decrease resistance
Show solution
Solution
The primary function of a salt bridge is to maintain charge balance by allowing ions to flow between the half-cells.
Correct Answer: B — To maintain charge balance
Learn More →
Q. What is the primary intermolecular force present in gases?
A.
Hydrogen bonding
B.
Dipole-dipole interactions
C.
London dispersion forces
D.
Ionic bonding
Show solution
Solution
London dispersion forces are the primary intermolecular forces in gases, as they are weak and allow for greater movement.
Correct Answer: C — London dispersion forces
Learn More →
Q. What is the primary intermolecular force present in liquid water?
A.
Ionic bonds
B.
Covalent bonds
C.
Hydrogen bonds
D.
Van der Waals forces
Show solution
Solution
Water molecules are held together primarily by hydrogen bonds.
Correct Answer: C — Hydrogen bonds
Learn More →
Q. What is the primary intermolecular force present in liquids?
A.
Ionic bonds
B.
Covalent bonds
C.
Dispersion forces
D.
Dipole-dipole interactions
Show solution
Solution
Liquids primarily exhibit dipole-dipole interactions due to the presence of polar molecules.
Correct Answer: D — Dipole-dipole interactions
Learn More →
Q. What is the primary intermolecular force present in water?
A.
Ionic bonds
B.
Covalent bonds
C.
Hydrogen bonds
D.
Van der Waals forces
Show solution
Solution
Water exhibits hydrogen bonding due to the presence of O-H bonds.
Correct Answer: C — Hydrogen bonds
Learn More →
Q. What is the primary mechanism of adsorption in physisorption?
A.
Chemical bonding
B.
Van der Waals forces
C.
Hydrogen bonding
D.
Ionic bonding
Show solution
Solution
Physisorption occurs primarily due to weak Van der Waals forces.
Correct Answer: B — Van der Waals forces
Learn More →
Q. What is the primary process involved in the adsorption of gases on solid surfaces?
A.
Diffusion
B.
Condensation
C.
Chemical reaction
D.
Van der Waals forces
Show solution
Solution
Adsorption of gases on solid surfaces primarily occurs due to Van der Waals forces, which are weak intermolecular forces.
Correct Answer: D — Van der Waals forces
Learn More →
Q. What is the primary reaction occurring in a lead-acid battery during discharge?
A.
Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O
B.
PbSO4 + 2H2O → Pb + PbO2 + 2H2SO4
C.
2Pb + 2H2SO4 → 2PbSO4 + H2
D.
PbO2 + 2H2SO4 → Pb + 2H2O + O2
Show solution
Solution
During discharge, the primary reaction in a lead-acid battery is Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O.
Correct Answer: A — Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O
Learn More →
Q. What is the primary reason for the compressibility of gases?
A.
High density
B.
Low temperature
C.
Large intermolecular spaces
D.
Strong intermolecular forces
Show solution
Solution
Gases are highly compressible due to large intermolecular spaces between particles.
Correct Answer: C — Large intermolecular spaces
Learn More →
Q. What is the primary reason for the elevation of boiling point in a solution?
A.
Increased molecular weight
B.
Decreased vapor pressure
C.
Increased solubility
D.
Decreased temperature
Show solution
Solution
The elevation of boiling point occurs because the presence of solute lowers the vapor pressure of the solvent, requiring a higher temperature to reach boiling.
Correct Answer: B — Decreased vapor pressure
Learn More →
Q. What is the primary reason for the formation of a precipitate in a saturated solution?
A.
Excess solute
B.
Temperature increase
C.
Change in pH
D.
Decrease in solubility product
Show solution
Solution
A precipitate forms when the ionic product exceeds the solubility product (Ksp) of the salt.
Correct Answer: D — Decrease in solubility product
Learn More →
Q. What is the primary reason for the high boiling point of water compared to other similar-sized molecules?
A.
Hydrogen bonding
B.
Van der Waals forces
C.
Ionic bonding
D.
Covalent bonding
Show solution
Solution
The high boiling point of water is primarily due to hydrogen bonding between water molecules.
Correct Answer: A — Hydrogen bonding
Learn More →
Q. What is the primary reason for the increase in pH when a weak acid is titrated with a strong base?
A.
Formation of water
B.
Neutralization of acid
C.
Formation of a conjugate base
D.
All of the above
Show solution
Solution
All of the above factors contribute to the increase in pH during the titration of a weak acid with a strong base.
Correct Answer: D — All of the above
Learn More →
Showing 811 to 840 of 1494 (50 Pages)