MCQ Collection
MDCAT Chemistry MCQs
Practice MDCAT Chemistry questions with answers and explanations.
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Correct Answer: D. Reaction of an acid and base to form water and a salt
Explanation:
In many aqueous neutralizations, H+ and OH- form water.
The remaining ions form a salt.
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Correct Answer: D. 4
Explanation:
For the 1:1 equation, Kc=[B]/[A].
Kc=0.80/0.20=4.
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Correct Answer: A. A substance changing color over a characteristic pH range
Explanation:
Acid-base indicators have differently colored protonated and deprotonated forms.
They help identify titration endpoints.
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Correct Answer: A. 1
Explanation:
The equilibrium expression is Kc=[B]/[A]^2.
Kc=0.25/(0.50)^2=1.
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Correct Answer: B. A quantitative method using a standard solution to determine unknown concentration
Explanation:
Titration uses a measured reaction stoichiometry.
The endpoint signals that the required amount of titrant has been added.
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Correct Answer: B. Toward products
Explanation:
Because Q<K, more products must form.
The reaction proceeds forward until Q reaches K.
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Correct Answer: C. Point where stoichiometrically equivalent acid and base amounts have reacted
Explanation:
The equivalence point is defined by reaction stoichiometry.
Its pH depends on acid and base strengths.
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Correct Answer: C. A substance that increases H+ concentration in water
Explanation:
Arrhenius acids produce hydrogen ions in aqueous solution.
The model applies specifically to water.
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Correct Answer: D. A substance that increases OH- concentration in water
Explanation:
Arrhenius bases increase hydroxide-ion concentration in water.
Many metal hydroxides fit this definition.
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Correct Answer: A. A proton donor
Explanation:
Brønsted-Lowry acid-base reactions involve proton transfer.
The acid loses H+ to a base.
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Correct Answer: B. A proton acceptor
Explanation:
A Brønsted-Lowry base accepts H+.
It forms its conjugate acid.
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Correct Answer: C. An electron-pair acceptor
Explanation:
Lewis theory focuses on electron-pair transfer.
Many metal ions and electron-deficient molecules act as Lewis acids.
