(a) Visha plotted a graph between concentration of R and time for a reaction R\rightarrow P. 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 20\; ^{o}/_{o} decomposition. Calculate t_{1/2}
[Given :log\; 2=0.3010,\; log\; 3=0.4771,\; log\; 4=0.6021]

 

 
 
 
 

Answers (1)

(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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