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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


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