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Why the apples, pears, bananas, etc. cha...

Why the apples, pears, bananas, etc. change their colour when they cut nd exposed to air?

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Apples, pears, bananas, potatoes, etc. contain enzyme called polyphenoloxidase or tryosinese, which reacts with oxygen and changes the colour on the surface of the fruit.
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VGS PUBLICATION-BRILLIANT-CHEMICAL REACTIONS AND EQUATIONS-ESSENTIAL MATERIAL FOR EXAMINATION PURPOSE
  1. Define double displacement reaction and give an example.

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  2. What is oxidation - reduction reaction or redox reaction ? Give one ex...

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  3. Why the apples, pears, bananas, etc. change their colour when they cut...

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  4. What do you mean by corrosion? How can you prevent it ?

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  5. Write the chemical equation for tranishing of silver wear (black coati...

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  6. What is Galvanizing?

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  7. What is an alloy ? Give two examples for alloys.

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  8. What type of reaction is rancidity?

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  9. Write the chemical reaction for bleaching of coloured objects using mo...

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  10. Why the white washig gives shiny finish to the walls?

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  11. Why the smell and taste of food items change?

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  12. ''Freshly cut apple turning brown, the iron articles shiny when new, b...

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  13. What are new substances formed due to decomposition of lead nitrate?

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  14. Balance the following chemical equation. C(2)H(6)+O(2)rarr CO(2)+H(2)O

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  15. What are antioxidants?

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  16. Which type of reaction involved when silver bromide is exposed to sunl...

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  17. NH(4)Cl rarr NH(3)+HCl . Which type of reaction is the ?

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  18. Jagadeesh saw 10 grams of unknowns substance in a beaker. He pour wate...

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  19. Some quantity of yellow coloured powerd was kept in the sunlight for s...

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  20. Redox reaction : CuO+H(2)overset("Heat")rarr Cu+H(2)O. By seeing the...

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