Standard reduction potentials (SRP) for different systems can be used to decide the spontaneity of a reaction e.g., `E_(2n^(2+)//Zn)^(@)=-0.76V`, hence for the reaction `Zn+2H^(+)rarrZn^(2+)+H_(2),DeltaG^(@)` is negative. It has been found experimentally that if (SRP of an oxidant-SRP of a reductant) is more than 1.7V, then their combination may lead to explosion (though it may be prevented by kinetic factors).
Now go through the following data and answer the questions.
Data:
Which statement about standard reduction potentials in correct?
A. `E_(H^(+)//H_(2))^(@)=` zero at all temperature
B. `E_(D^(+)//D_(2))^(@)=` Zero at 298 K
C. A redox reaction is feasible if sum of SRP of oxidant and that of reductant is a negative quantity.
D. `K_(2)Cr_(2)O^(7)` (acid) is stronger oxidising agent than `KMnO_(4)` (acid).
