A) an interaction with nitrogen of the air at very low temperatures
B) a change in the partial pressure of oxygen in the air
C) a change in the crystalline structure of tin
D) an interaction with water vapour contained in the humid air
Correct Answer: C
Solution :
Grey tin is very brittle and easily crumbles down to a powder in very cold climates. \[\underset{(cubic)}{\mathop{Grey\text{ }tin}}\,=\underset{(tetragonal)}{\mathop{white\text{ }tin}}\,\]
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