GKFix MCQ Question

Which of the following is used in breathalyzer tests?

• A. MnO4– + 8H+ + 5e– → Mn2+ + 4H2O 1.51
• B. Cr2O72– + 14H+ + 6e– → 2Cr3+ + 7H2O 1.33
• C. O2(g) + 4H+ + 4e– → 2H2O 1.23
• D. Br2 + 2e– → 2Br– 1.09