Question

Ethylene absorbent used during storage is

• A. CaCl₂
• B. CaCO₃
• C. KMnO₄
• D. NH₃

Hint:

Potassium permanganate (KMnO\(_4\)) is well-known for its distinctive deep purple color and its strong oxidizing properties. In post-harvest, its main role is as an ethylene scavenger.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The question asks to identify a chemical compound used to absorb or remove ethylene gas from the storage environment of fruits and vegetables.

Step 2: Detailed Explanation:
Since ethylene promotes ripening and senescence, removing it from storage atmospheres can significantly extend the shelf life of produce. This is done using "ethylene scrubbers" or absorbents. Potassium permanganate (KMnO\(_4\)) is a very strong oxidizing agent. When ethylene gas comes into contact with it, KMnO\(_4\) oxidizes the ethylene into ethylene glycol and carbon dioxide, effectively removing it from the air. KMnO\(_4\) is typically impregnated on an inert carrier like silica gel or alumina (often sold as purple-colored beads) and placed in packages or storage rooms. \[\begin{array}{rl} \bullet & \text{CaCl₂ (Calcium chloride) is a desiccant used to absorb moisture.} \\ \bullet & \text{CaCO₃ (Calcium carbonate) is largely inert in this context.} \\ \bullet & \text{NH₃ (Ammonia) is a gas and not an absorbent.} \\ \end{array}\]

Step 3: Final Answer:
The ethylene absorbent used during storage is KMnO₄ (Potassium permanganate).