# (a) Visha plotted a graph between concentration of and time for a reaction . On the basis of this graph, answer the following questions :(i) Predict the order of reaction.(ii) What does the slope of the line indicate ?(iii) What are the units of rate constant ?(b) A first order reaction takes 25 minutes for decomposition. Calculate  [Given :]

(a)

(i) Order of reaction is zero order

(ii) slope = - k, concentration decreases linearly

(iii) Units of rate constant are molL-1s-1

(b) k = 2.303/t

log [A0]/[A] = (2.303/25) log 100/75 = (2.303/25) log4/3 = 2.303/25(0.6021 – 0.4771) = 0.0115 min-1t1/2 = 0.693/k = 0.693/0.0115 = 60.26 min

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