A) a change in the crystalline structure of tin
B) an interaction with nitrogen of the air at very low temperatures
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 :
As temperature decreases, white tin (\[\beta -\]form) changes to grey tin (\[\alpha -\]form). \[\alpha -Sn\beta -Sn\] \[\alpha -Sn\]has a much lower density.
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