How can a redox reaction be used as a source of electrical energy?

A. Two half-reactions must be physically separated.

B. Two half-reactions must involve more than one electron.

C. One half-reaction must use a metal wire electrode.

D. One half-reaction must involve two metals.

Two half-reactions must be physically separated.

Explanation:

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

i think it's letter a.