First slide

Classical idea of redox reactions

Question

Which of the following is a redox reaction?

Moderate

A

$NaCl + {KNO}_{3} ⟶ {NaNO}_{3} + KCl$
B

${CaC}_{2} O_{4} + 2 HCl ⟶ {CaCl}_{2} + H_{2} C_{2} O_{4}$
C

$Mg (OH)_{2} + 2 {NH}_{4} Cl ⟶ {MgCl}_{2} + 2 {NH}_{4} OH$
D

$Zn + 2 AgCN ⟶ 2 Ag + Zn (CN)_{2}$

Solution

$\begin{array}{l} Zn ⟶ {Zn}^{2 +} + 2 e^{-} \\ {Ag}^{\oplus} + e^{-} ⟶ Ag \end{array}$
In (1), (2), and (3), oxidation number does not change.

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