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Try this Science Teaser….
Nisha’s mother was packing her lunch box. She tried to put an apple in it. But the fruit was big. So, she cut it into two halves and placed it inside. At lunch time, when Nisha opened the box, she found that the apple had turned brown in colour. She thought, “Now I know why mummy says that apples contain iron.” How did Nisha come to that conclusion?
Solution:
The apple was cut open. So, the pulp inside was exposed to air. It had turned brown. Obviously, some ingredient in the apple pulp had undergone a chemical reaction with constituents of air. Oxygen which is a major component of air reacts easily with substances and forms oxides. The brown colour of the apple was due to iron oxide. It was thus easy for Nisha to conclude that the apple contains iron.
-Team ScienceNow
