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2140. Iron rust is

September 7, 2025 by Admin

Ferrous oxide

Hydrated ferric oxide

Powdered iron

Ferric sulphide

✅ The correct answer is option B.

Categories Chemical Engineering, Engineering, Materials and Construction MCQs Tags Chemical Engineering MCQs, Engineering MCQs, Materials and Construction MCQs

2137. All materials obey Hooke’s law within elastic limit. When elastic limit is reached, the tensile strain

2143. To improve the machinability of steel, it is generally subjected to

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