MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: D. Induced current opposes the change that produces it
Explanation:
Lenz's law gives the direction of induced current.
It reflects conservation of energy.
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Correct Answer: A. The -COO- linkage between carbon groups
Explanation:
Esters are commonly formed from carboxylic acids and alcohols.
Many have characteristic odors.
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Correct Answer: B. A nitrogen-containing amino group
Explanation:
Amines are derivatives of ammonia.
The nitrogen lone pair often makes them basic.
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Correct Answer: C. Potential energy per unit charge
Explanation:
Electric potential is a scalar measured in volts.
Potential difference drives charge movement in circuits.
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Correct Answer: D. A carbon-based compound, usually containing C-H bonds
Explanation:
Organic chemistry mainly studies carbon compounds.
Some carbon compounds such as carbonates and carbon dioxide are treated as inorganic.
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Correct Answer: D. Rate of flow of electric charge
Explanation:
Current is I=Q/t.
Its SI unit is the ampere.
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Correct Answer: A. A compound containing only carbon and hydrogen
Explanation:
Hydrocarbons are the simplest organic compounds.
They include alkanes, alkenes, alkynes, and aromatic compounds.
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Correct Answer: A. Energy transferred per unit charge
Explanation:
Potential difference is V=W/Q.
One volt equals one joule per coulomb.
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Correct Answer: A. Their ns and (n-1)d electrons have similar energies
Explanation:
Both s and d electrons may participate in bonding or ion formation.
This permits several stable oxidation states.
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Correct Answer: B. An ion or molecule donating an electron pair to a metal center
Explanation:
Ligands act as Lewis bases.
They form coordinate covalent bonds with metal ions.
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Correct Answer: C. Number of donor atoms directly bonded to the central metal
Explanation:
Coordination number counts metal-ligand attachment sites.
A bidentate ligand contributes two donor atoms.
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Correct Answer: D. A charged species containing a central metal bonded to ligands
Explanation:
Complex ions have coordinate bonds between metal and ligands.
Their charge includes metal and ligand charges.
