1
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Question

The plot of concentration of a reactant vs time for a chemical reaction is shown below: The order of this reaction with respect to the reactant is:

A
0.0
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B
1
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C
2
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D
not possible to determine from this plot
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Solution

The correct option is A 0.0Consider a zero order reaction. A→P At t = 0, concentration is C0. At t = t, concentration is Ct. ∴−dCdt=kdC=−kdt Upon integration, [C]CtC0=−k[t]t0Ct=C0−kt Comparing this to straight line equation y=mx+cCt=−kt+C0 Slope=−k (decreasing slope) Intercept=C0 Since the given slope is in negative, rate is zero order.

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