Mr. Kumar runs a small garment making factory in a premises having a roof made of asbestos sheets. These asbestos sheets are supported on long wooden planks are fixed to planks with J-shaped hooks. For the last many days, the workers of factory are complainig to Mr. Kumar that the new clother made by them and kept on hangers are getting spoiled with a red brown powdery substace. Mr. Kumar tried his best but could not locate the surface of this substance which was spoiling theri newly fabricated clothes. One day Mr. Kumar's son Rajesh who is a studen of class `X`, came to the factory. Mr. Kumar told him the problem which he was facing for the last so many days. Rajesh went near the clothes which had been spoiled, looked up at the roof carefully from that place and understood the problem. He explained everything to his father. He also suggested the measure to be taken to solve this problem. Mr. Kumar was very happy.
(a) What is the red -brown powdery substance known as?
(b) From where do you think this substance was coming on the newly made garments in the factory?
(c) What type of chemical reaction is involved in the formation of red -brown substance?
(d) What is the general name of the process in which metals are eaten up by air or moisture, etc?
(e) What is the special name of the above process if the metal involved is iron?
(f) What suggestion do you think was given by Rajesh to solve this problem?
(g) What values are displayed by Rajesh in this episode?

Explanation

(a) The red-brown powdery substance is called rust.
(b) The red -brown substance (or rust) was falling down from the rusted iron hooks used in fixing asbestos sheets of roof to the wooden planks.
(c) Oxidation reaction in involved in the formation of red-brown substance [in which the iron metal of hook is oxidised by the oxygen of air in the presence of moisture to form hydrated iron (III) oxide called rust].
(d) Corrosion of metals.
(e) Rusting of iron
(f) Rajesh must have suggested painting the iron hooks (after cleaning them throughly).
(g) The values displayed by Rajesh in this episode are (i) Careful observation (ii) Knowledge of rusting of iron and its prevention, and (iii) Problem solving skills.