Question

Which of the following is not a redox reaction?

• A. $\mathrm { CuO } + \mathrm { H } _ { 2 } \rightarrow \mathrm { Cu } + \mathrm { H } _ { 2 } \mathrm { O }$
• B. $\mathrm { Na } + \mathrm { H } _ { 2 } \mathrm { O } \rightarrow \mathrm { NaOH } + \frac { 1 } { 2 } \mathrm { H } _ { 2 }$
• C. $\mathrm { CaCO } _ { 3 } \rightarrow \mathrm { CaO } + \mathrm { CO } _ { 2 }$
• D. $2 \mathrm {~K} + \mathrm { F } _ { 2 } \rightarrow 2 \mathrm { KF }$

Answer 1

Answer: (C)

$\mathrm { CaCO } _ { 3 } \rightarrow \mathrm { CaO } + \mathrm { CO } _ { 2 }$

Answer 2

:

Since there is no change in oxidation number of any species, it is not a redox reaction.