Question

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

पर्याय

• \[\ce{CuO + H2 -> Cu + H2O}\]

• \[\ce{Fe2O3 + 3CO -> 2Fe + 3CO2}\]

• \[\ce{2K + F2 -> 2KF}\]

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

Answer 1

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

Explanation:

Redox reaction is defined as the simultaneous oxidation and reduction of reacting species. Thus, change in oxidation state will decide whether a reaction is redox or not. Thus, assigning the oxidation states as:

(i) \[\ce{CuO + H2 -> Cu + H2O}\]

Here, oxidation of H and reduction of \[\ce{Cu}\] is taking place.

(ii) \[\ce{Fe2O3 + 3CO -> 2Fe + 3CO2}\]

Here, oxidation of \[\ce{C}\] and reduction of \[\ce{Fe}\] is taking place.

(iii) \[\ce{2K + F2 -> 2KF}\]

Here, the oxidation of \[\ce{K}\] and reduction of \[\ce{F}\] is taking place.

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

This is not a redox reaction, but it is a double displacement reaction.