The **instantaneous rate** of a reaction at time $t$ is obtained from a concentration–time graph as:
AThe slope of the tangent at time $t$
BThe mean of all rates
CThe y-intercept of the curve
DThe area under the curve up to $t$
Answer & Solution
Correct answer: A. The slope of the tangent at time $t$
Instantaneous rate = $-dc/dt$ (for a reactant) is the slope of the tangent at that instant on the c vs t curve. Average rate uses Δc/Δt across an interval.
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