Which of the following chemical equations represents a redox reaction?

a. 2na + 2h2o → 2naoh + h2
b. hcl + koh → kcl + h2o
c. agno3(aq) + nacl(aq) → nano3(aq) + agcl(s) + h2o(l)
d. fe3+ + 3no3– + 3na+ + 3oh–→ fe(oh)3 + 3na+ + 3no3–

Explanation:

Redox reaction is a reaction in which both oxidation and reduction reactions are carried out.

In given reactions, if we observe the reaction that indicating redox reaction is

This is because in this reaction oxidation number of sodium is increased from . And thus it is oxidized while the oxidation number of hydrogen is decreased from

Hence this reaction is redox reaction

im pretty sure its b

the answer is option a.