List of top Chemistry Questions on Redox reactions asked in KCET

Which of the following will not act as an oxidising agent?

a C\(_2\)O\(_4\)\(^{2-}\) + b MnO\(_4\)\(^{-}\) + c H\(^+\) \(\rightarrow\) x Mn\(^{2+}\) + y H\(_2\)O + z CO\(_2\)
a and x respectively are