The correct answer is A. Brainliest would be much appreciated.
ok im not full sure man but i would say multiple voltaic cells that have spontaneous half reactions
im sorry hope it helps
Under acidic conditions, the solution is red, and under alkaline conditions, the solution is blue. Chemical reactions other than acid-base can also cause a color change to litmus paper. For instance, chlorine gas turns blue litmus paper white – the litmus dye is bleached, because of presence of hypochlorite ions.
