Due to which of the following reasons does aluminium not corrode in atmosphere? In thermocouples, which of the following pairs is commonly used?
Understand the Problem
The question asks about the reasons why aluminium does not corrode in the atmosphere. It presents options that suggest the properties of aluminium and its reaction with oxygen. The second question inquires about commonly used pairs in thermocouples, also providing multiple choice answers. Both questions focus on material properties and applications in metallurgy.
Answer
Aluminium: Protective oxide layer; Thermocouple: Copper-constantan.
The final answer for why aluminium does not corrode is B: Atmospheric oxygen forms a protective oxide layer. The commonly used thermocouple pair is A: Copper-constantan.
Answer for screen readers
The final answer for why aluminium does not corrode is B: Atmospheric oxygen forms a protective oxide layer. The commonly used thermocouple pair is A: Copper-constantan.
More Information
Aluminium forms a thin oxide layer that stops further corrosion. Copper-constantan is used in thermocouples due to its reliability and wide temperature range.
Tips
A common mistake is to assume aluminium doesn't react with oxygen at all. It actually forms a protective oxide layer.
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