Question

Choose the correct option.

Which of the following is not an example of redox reaction?

Options

• \[\ce{CuO + H2->Cu + H2O}\]

• \[\ce{Fe2O3 + 3CO2->2Fe + 3CO2}\]

• \[\ce{2K + F2->2KF}\]

• \[\ce{BaCl2 + H2SO4->BaSO4 + 2HCl}\]

Answer 1

\[\ce{BaCl2 + H2SO4->BaSO4 + 2HCl}\]

Explanation:

\[\ce{\underset{\underset{+2}{↓}}{C}u\underset{\underset{-2}{↓}}{O} + \underset{\underset{0}{↓}}{H2} -> \underset{\underset{0}{↓}}{C}u + \underset{\underset{+1}{↓}}{H2}\underset{\underset{-2}{↓}}{O}}\]

\[\ce{\underset{\underset{+3}{↓}}{F}e2\underset{\underset{-2}{↓}}{O3} + 3\underset{\underset{+2}{↓}}{C}\underset{\underset{-2}{↓}}{O} -> 2\underset{\underset{0}{↓}}{F}e + 3\underset{\underset{+4}{↓}}{C}\underset{\underset{-2}{↓}}{O2}}\]

\[\ce{2\underset{\underset{0}{↓}}{K} + \underset{\underset{0}{↓}}{F2} -> 2\underset{\underset{+1}{↓}}{K}\underset{\underset{-1}{↓}}{F}}\]

\[\ce{\underset{\underset{+2}{↓}}{B}a\underset{\underset{-1}{↓}}{C}l2 + \underset{\underset{+1}{↓}}{H2}S\underset{\underset{-2}{↓}}{O4} -> \underset{\underset{+2}{↓}}{B}a\underset{\underset{+6}{↓}}{S}\underset{\underset{-2}{↓}}{O4} + 2\underset{\underset{+1}{↓}}{H}\underset{\underset{-1}{↓}}{C}l}\]