Question

Which chemical equation represents a redox reaction? A. Mg(ClO3)2 + 2HCl → MgCl2 + 2HClO3 B. CO + H2O → H2 + CO2 C. 2NH4NO3 + CuCl2 → 2NH4Cl + Cu(NO3)2 D. Na2SO3 + FeBr2 → 2NaBr + FeSO3

Answer 1

(B) part shows redox reaction

Answer 2

Answer: The correct option is B.

Explanation: Redox reactions are considered as the chemical reactions in which one reactant undergoes reduction process and one reactant undergoes oxidation process.

Reduction reactions are the reactions in which gain of electrons takes place.

Oxidation reactions are the reactions in which loss of electrons takes place.

From the given options above, only option B is a type of redox reaction.

$CO+H_2O\rightarrow H_2+CO_2$

In this the carbon is getting oxidized from (+2) to (+4) oxidation state and hydrogen is getting reduced from (+1) to (0) oxidation state. Hence, this reaction is considered  as a redox reaction.

In all the other parts, the oxidation states of cations and anions are the same for the reactants and products.