Q. What is the van 't Hoff factor (i) for glucose in solution?
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Solution
The van 't Hoff factor (i) for glucose is 1, as it does not dissociate in solution.
Correct Answer: A — 1
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Q. What is the van 't Hoff factor for a non-electrolyte solute?
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Solution
For a non-electrolyte solute, the van 't Hoff factor (i) is 1, as it does not dissociate into ions.
Correct Answer: B — 1
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Q. What is the vapor pressure of a solution containing 0.1 mol of a non-volatile solute in 1 kg of water? (Vapor pressure of pure water = 23.76 mmHg)
A.
22.88 mmHg
B.
21.76 mmHg
C.
20.76 mmHg
D.
19.76 mmHg
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Solution
Vapor pressure = P°_solvent * (n_solvent / (n_solvent + n_solute)) = 23.76 * (55.5 / (55.5 + 0.1)) = 22.88 mmHg
Correct Answer: A — 22.88 mmHg
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Q. What is the vapor pressure of a solution containing 1 mole of a non-volatile solute in 3 moles of solvent, assuming ideal behavior?
A.
0.25 P0
B.
0.75 P0
C.
1.0 P0
D.
0.5 P0
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Solution
Vapor pressure lowering = (moles of solute / total moles) * P0 = (1 / (1 + 3)) * P0 = 0.25 P0, so vapor pressure = P0 - 0.25 P0 = 0.75 P0.
Correct Answer: B — 0.75 P0
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Q. What is the vapor pressure of a solution containing 1 mole of a non-volatile solute in 9 moles of solvent, if the vapor pressure of the pure solvent is 100 mmHg?
A.
90 mmHg
B.
100 mmHg
C.
10 mmHg
D.
80 mmHg
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Solution
Using Raoult's law, P_solution = X_solvent * P°_solvent = (9/10) * 100 mmHg = 90 mmHg.
Correct Answer: A — 90 mmHg
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Q. What is the vapor pressure of a solution containing 1 mole of a non-volatile solute in 10 moles of solvent, assuming ideal behavior?
A.
0.1 P0
B.
0.9 P0
C.
1.0 P0
D.
0.5 P0
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Solution
Using Raoult's law, the vapor pressure of the solution = (moles of solvent / total moles) * P0 = (10 / 11) * P0 = 0.909 P0.
Correct Answer: B — 0.9 P0
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Q. What is the vapor pressure of a solution containing 1 mole of non-volatile solute in 3 moles of solvent if the vapor pressure of the pure solvent is 100 mmHg?
A.
75 mmHg
B.
100 mmHg
C.
25 mmHg
D.
50 mmHg
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Solution
Using Raoult's law, P_solution = X_solvent * P°_solvent. X_solvent = 3/(1+3) = 0.75, so P_solution = 0.75 * 100 mmHg = 75 mmHg.
Correct Answer: A — 75 mmHg
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Q. What is the vapor pressure of a solution containing 1 mole of solute in 3 moles of solvent, assuming ideal behavior?
A.
0.25 P0
B.
0.75 P0
C.
0.5 P0
D.
P0
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Solution
Using Raoult's law, the vapor pressure of the solution = (moles of solvent / total moles) * P0 = (3 / (3 + 1)) * P0 = 0.75 P0.
Correct Answer: B — 0.75 P0
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Q. What is the vapor pressure of a solution containing a non-volatile solute compared to the pure solvent?
A.
Higher than the pure solvent
B.
Lower than the pure solvent
C.
Equal to the pure solvent
D.
Unpredictable
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Solution
The vapor pressure of a solution containing a non-volatile solute is lower than that of the pure solvent due to the presence of solute particles.
Correct Answer: B — Lower than the pure solvent
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Q. What is the volume occupied by 1 mole of an ideal gas at STP (Standard Temperature and Pressure)?
A.
22.4 L
B.
24.0 L
C.
18.0 L
D.
20.0 L
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Solution
At STP, 1 mole of an ideal gas occupies 22.4 liters.
Correct Answer: A — 22.4 L
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Q. What is the volume occupied by 1 mole of an ideal gas at STP?
A.
22.4 L
B.
24 L
C.
20 L
D.
18 L
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Solution
At STP, 1 mole of an ideal gas occupies 22.4 liters.
Correct Answer: A — 22.4 L
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Q. What is the volume occupied by 4 moles of an ideal gas at STP?
A.
22.4 L
B.
44.8 L
C.
67.2 L
D.
89.6 L
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Solution
At STP, 1 mole of gas occupies 22.4 L. Therefore, 4 moles occupy 4 x 22.4 L = 89.6 L.
Correct Answer: B — 44.8 L
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Q. What is the volume of 1 M NaOH solution required to obtain 0.5 moles of NaOH?
A.
0.5 L
B.
1 L
C.
2 L
D.
0.25 L
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Solution
Using the formula M = moles/volume, Volume = moles/M = 0.5 moles / 1 M = 0.5 L.
Correct Answer: A — 0.5 L
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Q. What is the volume of 1 mole of an ideal gas at STP (Standard Temperature and Pressure)?
A.
22.4 L
B.
24.0 L
C.
18.0 L
D.
20.0 L
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Solution
At STP, 1 mole of an ideal gas occupies 22.4 liters.
Correct Answer: A — 22.4 L
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Q. What is the volume of 1 mole of an ideal gas at STP?
A.
22.4 L
B.
24 L
C.
10 L
D.
1 L
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Solution
At STP (Standard Temperature and Pressure), 1 mole of an ideal gas occupies 22.4 liters.
Correct Answer: A — 22.4 L
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Q. What is the volume of 1 mole of gas at STP?
A.
22.4 L
B.
24 L
C.
20 L
D.
18 L
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Solution
At STP, 1 mole of gas occupies 22.4 liters.
Correct Answer: A — 22.4 L
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Q. What is the volume of 4 moles of an ideal gas at STP?
A.
22.4 L
B.
44.8 L
C.
89.6 L
D.
112 L
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Solution
Volume = moles x volume per mole = 4 moles x 22.4 L/mole = 89.6 L.
Correct Answer: C — 89.6 L
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Q. What is the volume of a 2 M solution that contains 4 moles of solute?
A.
2 L
B.
4 L
C.
1 L
D.
0.5 L
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Solution
Volume = moles of solute / molarity = 4 moles / 2 M = 2 L.
Correct Answer: B — 4 L
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Q. What is the volume of CO2 produced at STP when 2 moles of C2H5OH are completely combusted?
A.
22.4 L
B.
44.8 L
C.
67.2 L
D.
89.6 L
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Solution
C2H5OH + 3O2 → 2CO2 + 3H2O. 2 moles of C2H5OH produce 4 moles of CO2. Volume = 4 * 22.4 L = 89.6 L.
Correct Answer: B — 44.8 L
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Q. What is the volume percent concentration of a solution containing 30 mL of ethanol in 150 mL of solution?
A.
20%
B.
25%
C.
30%
D.
15%
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Solution
Volume percent = (volume of solute / total volume) x 100 = (30 mL / 150 mL) x 100 = 20%.
Correct Answer: B — 25%
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Q. What is the volume percent of ethanol in a solution made by mixing 30 mL of ethanol with 70 mL of water?
A.
30%
B.
70%
C.
50%
D.
20%
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Solution
Volume percent = (volume of solute / total volume) × 100 = (30 mL / (30 mL + 70 mL)) × 100 = 30%.
Correct Answer: A — 30%
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Q. What is the work done by a gas during an isothermal expansion from volume Vi to Vf?
A.
nRT ln(Vf/Vi)
B.
nR(Tf - Ti)
C.
Zero
D.
nRT
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Solution
The work done by a gas during an isothermal expansion is W = nRT ln(Vf/Vi).
Correct Answer: A — nRT ln(Vf/Vi)
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Q. What is the work done by an ideal gas during an isothermal expansion from volume Vi to Vf?
A.
nRT ln(Vf/Vi)
B.
nR(Tf - Ti)
C.
Zero
D.
nRT
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Solution
The work done by an ideal gas during an isothermal expansion is W = nRT ln(Vf/Vi).
Correct Answer: A — nRT ln(Vf/Vi)
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Q. What phenomenon occurs when a liquid rises in a narrow tube against gravity?
A.
Viscosity
B.
Surface tension
C.
Capillarity
D.
Hydrostatic pressure
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Solution
Capillarity is the phenomenon where liquid rises in a narrow tube due to surface tension.
Correct Answer: C — Capillarity
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Q. What role do enzymes play in biological systems?
A.
They provide structural support
B.
They act as catalysts for biochemical reactions
C.
They store genetic information
D.
They transport molecules across membranes
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Solution
Enzymes are proteins that act as catalysts, speeding up biochemical reactions without being consumed in the process.
Correct Answer: B — They act as catalysts for biochemical reactions
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Q. What type of adsorption is characterized by the formation of strong chemical bonds?
A.
Physisorption
B.
Chemisorption
C.
Desorption
D.
Multilayer adsorption
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Solution
Chemisorption is characterized by the formation of strong chemical bonds between the adsorbate and the adsorbent.
Correct Answer: B — Chemisorption
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Q. What type of adsorption occurs when the adsorbate forms strong chemical bonds with the adsorbent?
A.
Physisorption
B.
Chemisorption
C.
Desorption
D.
Sorption
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Solution
Chemisorption involves the formation of strong chemical bonds between the adsorbate and the adsorbent.
Correct Answer: B — Chemisorption
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Q. What type of alcohol is isopropanol?
A.
Primary
B.
Secondary
C.
Tertiary
D.
None of the above
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Solution
Isopropanol (2-propanol) is a secondary alcohol, as the hydroxyl group is attached to a carbon that is connected to two other carbons.
Correct Answer: B — Secondary
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Q. What type of biomolecule are enzymes classified as?
A.
Carbohydrates
B.
Proteins
C.
Lipids
D.
Nucleic acids
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Solution
Enzymes are primarily proteins that catalyze biochemical reactions.
Correct Answer: B — Proteins
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Q. What type of biomolecule is insulin?
A.
Carbohydrate
B.
Lipid
C.
Protein
D.
Nucleic acid
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Solution
Insulin is a protein hormone that regulates glucose levels in the blood.
Correct Answer: C — Protein
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