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Which statement correctly distinguishes a reversible reaction from an irreversible reaction?
AA reversible reaction proceeds only in the forward direction
BA reversible reaction can attain equilibrium, an irreversible one cannot
CAn irreversible reaction converts products fully back to reactants
DAn irreversible reaction is always slower than a reversible one
Answer & Solution
Correct answer: B. A reversible reaction can attain equilibrium, an irreversible one cannot
1. A reversible reaction proceeds in both forward and backward directions and can reach a state of equilibrium.
2. An irreversible reaction is unidirectional and does not attain equilibrium.
3. Option A and C describe irreversible features wrongly assigned, and an irreversible reaction is in fact relatively fast, not slow.
4. Therefore the reversible reaction attaining equilibrium while the irreversible one cannot is the correct distinction.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "Irreversible Reactions", p.151_
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