Chemical Kineti...

For the zero order reaction $$A\rightarrow 2B$$, the rate constant is $$2\times 10^{-6}M min^{-1}$$ the reaction is started with 10 M of A.

The time elapsed between $$33\%$$ and $$67\%$$ completion of a first order reaction is $$30$$ minutes. What is the time needed for $$25\%$$ completion?

A first order reaction follows the expression:

For the first order consecutive reaction $$P\rightarrow Q\rightarrow R$$ under steady state approximation to $$\left[ P \right] ,\left[ Q \right]$$ and $$\left[ R \right] $$ with time are best represented by:

Which among the following plots are liner (a-x) is the concentration of the reactant remaining after time, t? 
(1):-(a-x) vs t, for a first order reaction 
(2):- (a-x) vs t, for a zero order reaction 
(3):-(a-x) vs t, for a second order reaction 
(4):-1/ (a-x) vs t, for a second order reaction

A catalyst lower the energy of activation by $$25\%$$. The temperature at which rate of uncatalysed reaction would be equal to that of the catalyzed one at $$27^oC$$ is:

Which of the following represents the expression for $$\cfrac{3}{4}$$th life of first order reaction?

If a I-order reaction is completed to the extent of $$60\%$$ and $$20\%$$ in time intervals, $$t_1$$ and $$t_2$$ what is the ratio, $$t_1 : t_2$$?

The reaction $$v_1A + v_2B \rightarrow$$ products is first order with respect to $$A$$ and zero- order with respect to $$B$$.If the reaction is started with $$[A]_0$$ and $$[B]_0$$, the integrated rate expression of this reaction would be:

Fora reaction, $$ A \rightarrow B +C, $$ it was found that at the end of 10 minutes from the start, the total optical rotation of the system was $$ 50^o $$ and when the reaction is complete, it was $$ 100^o C $$ Assuming that only B and C are optically active and dextro rotatory, the rate constant of this first order reaction would be ?