Question

KMnO\(_4\) on heating at 513K produces:

• A. K\(_2\)MnO\(_4\)
• B. MnO\(_2\)
• C. Mn\(_2\)O\(_3\)
• D. MnO

Hint:

Potassium permanganate undergoes thermal decomposition at high temperatures, producing manganese dioxide as the main product.

Answer 1

The Correct Option is B

When potassium permanganate (KMnO\(_4\)) is heated at 513K, it undergoes a thermal decomposition reaction. The heat causes KMnO\(_4\) to break down, producing manganese dioxide (MnO\(_2\)), potassium hydroxide (KOH), and oxygen gas (O\(_2\)). The decomposition reaction is as follows: \[ 2KMnO_4 \xrightarrow{513K} 2MnO_2 + K_2O_2 + O_2 \] Thus, heating KMnO\(_4\) at 513K produces MnO\(_2\) (manganese dioxide).