question_answer

Of the following reaction, only one is a redox reaction. Identify this reaction.

A) \[Ca{{(OH)}_{2}}+2HCl\xrightarrow{{}}CaC{{l}_{2}}+2{{H}_{2}}O\]

B)  \[2{{S}_{2}}O_{7}^{2-}+2{{H}_{2}}O\xrightarrow{{}}2SO_{4}^{2-}+4{{H}^{+}}\]

C)  \[BaC{{l}_{2}}+MgS{{O}_{4}}\xrightarrow{{}}BaS{{O}_{4}}+MgC{{l}_{2}}\]

D)  \[C{{u}_{2}}S+2FeO\xrightarrow{{}}2Cu+2Fe+S{{O}_{2}}\]

Correct Answer: D

Solution :

  In this reaction Cu and Fe undergo reduction while sulphur undergoes oxidation. Hence, this is a redox reaction.