Question

Which of the following is not an example of redox reaction? (A) CuO + H2  Cu + H2O (B) Fe2O3 + 3CO  2Fe + 3CO2 (C) 2K + F2  2KF (D) BaCl2 +H2SO4  BaSO4 + 2HCl

Answer 1

Answer:

D) BaCl + H2SO4 → BaSO4 + 2HCl

Explanation:

Redox reaction involves 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:

(A) Cu+²O + H2⁰ → Cu⁰ + H+¹2O : oxidation of H and reduction of Cu

B) Fe2+³O3 + 3C+²O → 2Fe⁰ + 3C+⁴O2 : oxidation of C and reduction of Fe

(C) 2K⁰ + F2⁰ → 2K+¹F-¹: oxidation of K and reduction of F

(D) Ba+²Cl2 +H2SO4 → Ba+²SO4 + 2HCl : not a redox reaction.