Why oil is not stored in galvanized iron pot?

Question

Why oil is not stored in galvanized iron pot?

1. A. It produce toxic compound
2. B. It reduced quality of oil
3. C. Corrosion observed
4. D. All of above (Correct answer)

Correct Answer

Option D — All of above

Detailed Solution & Explanation

The correct answer is All of above.

Key Points

• All the reasons listed are valid, so oil is not stored in galvanised iron vessels.
• Galvanisation is the process of coating iron or steel with a protective layer of zinc to prevent rusting.
• However, zinc is chemically reactive, particularly towards the free fatty acids naturally present in edible oils.
• The reaction between zinc and these fatty acids produces zinc salts (zinc soaps), which are toxic and can cause zinc poisoning on ingestion.
• The same reaction degrades the quality of the oil, affecting its taste, odour and shelf life by promoting rancidity.
• Over time, the interaction also corrodes the zinc coating, exposing the iron beneath to further attack.
• For these reasons edible oils are stored in glass, food-grade plastic, tin-plated or stainless steel containers.

Exam Tip

• the same reactivity principle explains why pickles and curd, both acidic, are not kept in metal vessels — a classic everyday-chemistry question.

प्रश्न (हिन्दी में)

तेल को गैल्वनाइज्ड आयरन पॉट में क्यों नहीं रखा जाता है?

1. A. यह जहरीला यौगिक बनाता है
2. B. यह तेल की गुणवत्ता को कम करता है
3. C. जंग देखी जाती है
4. D. उपरोक्त सभी