Question

An old cycle frame was left in open for a few days. A ground layer got slowly deposited on its surface and could not be removed when rubbed with sandpaper, what actually happened? ​

Answer 1

Answer:

actually some of the compounds and elements were reacted with cycle frame.it may happen due to chemical reaction

Explanation:

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Answer 2

Answer:

The cycle frame is made up of iron. Upon exposure to the air, iron combined with oxygen and water vapour present as moisture to form a chemical compound with formula $Fe_2O_3.xH_2O$. It is known as hydrated ferric oxide and is in the form of a brown mass known as rust. Since a chemical reaction has taken place in the formation of rust and the change was permanent and could not be reversed.