You must have observed that iron articles are shiny when new, but get coated with a reddish brown powder when left for some time. This process is commonly known as rusting of iron. Some other metals also get tarnished in this manner. Have you noticed the colour of the coating formed on copper and silver? When a metal is attacked by substances around it such as moisture, acids, etc., it is said to corrode and this process is called corrosion. The black coating on silver and the green coating on copper are other examples of corrosion
Question
(i).Chemically rust is
(a).only ferric oxide
(b).hydrated ferric oxide
(c).hydrated ferrous oxide
(ii).Rusting of iron involves a chemical
reaction which is a combination of:
(a) Reduction as well as combination
reactions
(b) Oxidation as well
as combination
reactions
(c) Oxidation as well as displacement
reaction
(iii). Rusting of iron takes place in
(a) ordinary water
(b) both ordinary and distilled water
(c) distilled water
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Class 10 science
3 years
2021-12-19T18:09:06+00:00
2021-12-19T18:09:06+00:00 1 Answer
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Answer ( 1 )
Answer.
hydrated ferric oxide
Answer.
(b) Oxidation as well as combination
reactions
Answer.(b)
both ordinary and distilled water