The catalyzed reaction is first order in [ce4+] and first order in [mn2+]. which of the steps in the catalyzed mechanism is rate determining?

The answer is Ce^4+ (aq) + Mn^2+ (aq) ==> Ce^3+ (aq) + Mn^3+ (aq)

Explanation:

The reaction is first order with respect to Ce^4+ and first order with respect to Mn^2+ below.

Ce^4+ (aq) + Mn^2+ (aq) ==> Ce^3+ (aq) + Mn^3+ (aq)

The rate calculation,

Ce^4+ (aq) + Mn^2+ (aq) ==> Ce^3+ (aq) + Mn^3+ (aq)  

This is the catalyzed reaction.

the answer is either b or c

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current