Question

${\mathrm{KClO}}_3\underset{∆}{\overset{{\mathrm{MnO}}_2}{\to }}\mathrm{KCl}+{\mathrm{O}}_2$

For the above shown decomposition reaction of potassium chlorate, identify the incorrect statement:

• A. The physical state of ${\mathrm{KClO}}_3$ is solid.
• B. The physical state of ${\mathrm{O}}_2$ is gas.
• C. The above reaction is balanced.
• D. ${\mathrm{MnO}}_2$ plays the role of a catalyst.

Answer 1

The correct option is C

The above reaction is balanced.

Explanation for the correct option,

1. The above given reaction is not in balanced form, therefore, the balanced form of reaction is given as: $$\begin{gathered} 2{\mathrm{KClO}}_3\left(\mathrm{s}\right)\underset{∆}{\overset{{\mathrm{MnO}}_2}{\to }}2\mathrm{KCl}\left(\mathrm{s}\right)+3{\mathrm{O}}_2\left(\mathrm{g}\right) \\ (\mathrm{Potassium}\mathrm{chlorate})(\mathrm{Potassium}\mathrm{chloride})\left(\mathrm{Oxygen}\right) \end{gathered}$$.
2. The given reaction was not a balanced reaction, hence option (C) is the correct option.

Explanation for the incorrect option:

1. From the above equation it is clear that, the physical state of ${\mathrm{KClO}}_3$ is solid, hence option (A) is incorrect.
2. The physical state of ${\mathrm{O}}_2$ is gas, hence option (B) is incorrect.
3. and ${\mathrm{MnO}}_2$ plays the role of a catalyst, option (D) is incorrect.

Hence, the correct option is (C). i.e., The above reaction is balanced is an incorrect statement.