Redox Reactions in Chemistry : Practice MCQ Questions & Answers with Explanations

$VO_2^+ \rightarrow V_2O_3$

$Na \rightarrow Na^+$

$CrO_4^{2-} \rightarrow Cr_2O_7^{2-}$

$Zn^{2+} \rightarrow Zn$

50 mL of 0.5 M $C_2H_2O_4$

20 mL of 0.1 M $C_2H_2O_4$

20 mL of 0.5 M $C_2H_2O_4$

50 mL of 0.1 M $C_2H_2O_4$

$MnO_2$

$K_2MnO_4$

$Mn_3O_4$

$KMnO_4$

Increase in oxidation number

Decrease in oxidation number

No change in oxidation number

none of the above

Dissolution of Copper

Oxidation of Ag+ -> Ag

Reduction of Cu2+ ions

Oxidation of Cu atoms