Question

Preethi fixed charts with board pins in the bulletin
board.After two months she noticed that the charts are torn
and the board pins also changed its colour. Explain.

Answer 1

Answer:

Rust (Corrosion)

Explanation:

The board pins are made of iron ( Fe ) but after sometime there Oxygen and moisture in the air reacts with it and forms Rust ( Fe2O3 ). That is why it also changes colour.

Hope this helps :)

Answer 2

Answer:

They could be torn because of wind or any Strom and their colour would have been because of sunlight