Q16 of 66 Page 47

A first order reaction is 50% completed in 1.26 × 1014 s. How much time would it take for 100% completion?

Given, t1/2=1.261014 we know the reaction is a first order

t1/2=.693/k ……..for first-order reaction


using above given value we can find k



For 100% completion



At 100% completion R=0 so



Thus Option (iv) is correct.

More from this chapter

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14

Rate law for the reaction A + 2B → C is found to be

Rate = k [A][B]


Concentration of reactant ‘B’ is doubled, keeping the concentration of ‘A’ constant, the value of rate constant will be______.


 15

Which of the following statements is incorrect about the collison theory of chemical reaction?

 17

Compounds ‘A’ and ‘B’ react according to the following chemical equation.

A (g) + 2 B (g) → 2C (g)


Concentration of either ‘A’ or ‘B’ were changed keeping the concentrations of one of the reactants constant and rates were measured as a function of initial concentration. Following results were obtained. Choose the correct option for the rate equations for this reaction.



 18

Which of the following statement is not correct for the catalyst?