A) a change in the crystalline structure of tin
B) an interaction with nitrogen of the air at very low temperature
C) a change in the partial pressure of oxygen in the air
D) an interaction with water vapour contained in the humid air
Correct Answer: A
Solution :
Tin exists in three solid forms, grey tin, white tin and rhombic tin and all these three forms are inter convertible as \[\text{Grey}\text{White}\text{Rhombic}\] White tin is most stable form. The conversion of white tin in to grey tin takes place very slowly at 18°C. However, the temperature is low -50°C and a small amount of grey. tin is also present. The conversion becomes very rapid. This conversion is known as tin disease or tin post.
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