Question

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–

Answer 1

`$2Na+2H_(2)O \to 2NaOH+H_(2)$`

Step-by-step 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
`$2Na+2H_(2)O \to 2NaOH+H_(2)$`

This is because in this reaction oxidation number of sodium is increased from
`$0$ to $1$`. And thus it is oxidized while the oxidation number of hydrogen is decreased from
`$+1$ to $0$`

`$2Na^(0)+2H_(2)^(+1)O^(-2) \to 2Na^(+1)O^(-2)H^(+1)+H_(2)^(0)$`

Hence this reaction is redox reaction