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Question

Which of the following graphs is true for zero order reaction?

A
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B
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C
Both (a) and (b)
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D
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Solution

The correct option is C Both (a) and (b)
Consider a zero order reaction,
AProduct
Rate, R=K[A]0
d[A]dt=K[A]0
d[A]dt=K×1
d[A]=Kdt
Taking limit on both side
[A]t[a]0 d[A]=Kt0 dt

when,
time=0, A=[A]o
time=t, A=[A]t

[A][A]t[A]o=K[t]t0

[A]0[A]t=Kt

[A]t=[A]0Kt

Its in y=mx form.

Hence,
Plot between [A]t vs time :

For zero order reaction,
Rate, R=K(Rate constant)

Rate of Zero order reaction is equal to Rate constant of that reaction, which is independent of concentration. Hence, on increasing concentration of reactants, rate of reaction does not increase.
Plot of Rate Vs Concentration:

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