Question

State reasons for the following : (a) Iron articles get coated with a reddish brown powder when left for sometime in open. (b) Burning of coal is an exothermic reaction.(c) The chemical equations should be balanced.

Answer 1

hey...

The reddish brown layer on iron is rust. It is obtained due to rusting of that metal.When an iron metal is attacked by substances around it such as moisture,acids etc.. it is said to be corroded or rusted. That is why we find iron articles coated with that layer.

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Answer 2

Answer:

If we leave a piece of iron in the open for some time, it acquires a coating of brownish substance. This substance is called as rust and the process of its formation is called rusting.