MCQ Collection
ECAT MCQs
Practice ECAT questions with answers and explanations.
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Correct Answer: B. It usually increases rate
Explanation:
More exposed particles are available for collision.
Powders often react faster than large pieces.
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Correct Answer: C. Loss of electrons or increase in oxidation number
Explanation:
Oxidation and reduction occur together.
The oxidized species donates electrons.
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Correct Answer: D. Gain of electrons or decrease in oxidation number
Explanation:
A reduced species accepts electrons.
Reduction accompanies oxidation.
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Correct Answer: A. A species that causes oxidation and is itself reduced
Explanation:
The oxidizing agent accepts electrons.
Its oxidation number decreases.
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Correct Answer: B. A species that causes reduction and is itself oxidized
Explanation:
The reducing agent donates electrons.
Its oxidation number increases.
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Correct Answer: C. An electrochemical cell producing electrical energy from a spontaneous reaction
Explanation:
A galvanic or voltaic cell converts chemical energy into electrical energy.
Electrons flow through an external circuit.
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Correct Answer: D. A cell using electrical energy to drive a nonspontaneous reaction
Explanation:
Electrolysis requires an external power source.
It can produce metals, gases, or chemical changes.
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Correct Answer: A. 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: A. At the anode
Explanation:
The mnemonic 'An Ox' identifies oxidation at the anode.
Electrons are produced there.
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Correct Answer: B. 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: B. At the cathode
Explanation:
The mnemonic 'Red Cat' identifies reduction at the cathode.
Electrons are consumed there.
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Correct Answer: C. Change in concentration of reactant or product per unit time
Explanation:
Reaction rate measures how fast composition changes.
It may be expressed using disappearance or formation rates.
