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1315

Q:

The color of a cut apple turns brown after some time because it reacts with air to form-

  • 1
    Iron Oxide
  • 2
    Potassium oxide
  • 3
    Aluminum oxide
  • 4
    Sodium oxide
  • Show Answer
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Answer : 1. "Iron Oxide"
Explanation :

Apple contains an enzyme known as polyphenol oxidase (PPO). This enzyme when comes in contact with oxygen molecules oxidized polyphenols into o-quinones. These o-quinones thus form reacts with the neighboring amino acids to produce melanins.

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