Corrosion and rancidity — task. Chemistry CBSE Live product, Class 10 (2026-27).

Pick the correct answer:

1. What is the best explanation for classifying rusting as a chemical change?

It can be reversed
It forms a new substance with different chemical properties
It can be obtained again by cleaning
Rusting is a physical change

2. Nitrogen gas is used in food packaging because it:

kill microbes present in the chips
decrease the shelf life by removing moisture
an inert gas that prevents oxidation
enhance the flavour of chips

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