MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: C. A measure related to energy dispersal and number of accessible microstates
Explanation:
Greater dispersal and more possible arrangements generally mean higher entropy.
Gases usually have higher entropy than liquids or solids.
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Correct Answer: C. It can change K
Explanation:
Temperature alters the balance between forward and reverse energetics.
K is constant only at a specified temperature.
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Correct Answer: D. A process thermodynamically favored under specified conditions
Explanation:
Spontaneity describes direction, not speed.
A spontaneous reaction may still be very slow.
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Correct Answer: A. A thermodynamic function used to predict spontaneity at constant temperature and pressure
Explanation:
Gibbs energy change is ΔG=ΔH-TΔS.
Negative ΔG indicates a thermodynamically favorable direction.
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Correct Answer: B. ΔG = 0
Explanation:
At equilibrium there is no net driving force for change.
The reaction mixture has minimum Gibbs energy under the conditions.
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Correct Answer: C. Dynamic state where forward and reverse reaction rates are equal
Explanation:
At equilibrium, concentrations remain constant over time.
Molecules continue reacting in both directions.
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Correct Answer: D. A ratio of product and reactant activities at equilibrium
Explanation:
The equilibrium expression follows stoichiometric powers.
Its value depends on temperature.
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Correct Answer: A. Products are strongly favored at equilibrium
Explanation:
A large K means the equilibrium mixture contains mostly products.
It does not directly indicate reaction speed.
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Correct Answer: B. Reactants are strongly favored at equilibrium
Explanation:
A small K means little product is present at equilibrium.
The forward reaction may still occur.
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Correct Answer: C. A ratio with the equilibrium-expression form using current concentrations or pressures
Explanation:
Q can be calculated at any stage.
Comparing Q with K predicts the direction of net change.
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Correct Answer: D. Toward products
Explanation:
The mixture contains too little product relative to equilibrium.
Net forward reaction increases Q toward K.
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Correct Answer: A. Heat required to raise an object's temperature by one degree
Explanation:
Heat capacity depends on the amount and identity of matter.
Specific heat capacity is heat capacity per unit mass.
