Question

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Answer 1

Explanation:

• CuO + C -----> Cu + CO2

CuO is oxidizing agent.

C is reducing agent.

• White Crystal is of Lead Nitrate and brown fumes are of Nitrogen dioxide.

Pb(NO3)2 -------> PbO + NO2 + O2

• When oil and fats present in food substances is oxidized by atmospheric oxygen, it is cause of bad smell and taste of food substances is known as Rancidity.
• Method to prevent Rancidity

1. By adding salt and vinegar
2. By freezing food substances
3. By adding Nitrogen gas
4. By adding antioxidants like BHA, BHT etc

Answer 2

Answer:

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