The concentration of A in a first order reaction, A → B, decreases_____________________?
Correct answer: B. Exponentially with time
- A. Linearly with time
- B. Exponentially with time
- C. Very abruptly towards the end of the reaction
- D. Logarithmically with time
Explanation
Integrating the first-order rate law gives C_A = C_A0e⁻ᵏᵗ, so concentration falls exponentially rather than linearly with time. A logarithmic relation applies to ln(C_A0/C_A), not to concentration itself.
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