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The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. Gray metallic tin buttons got converted to white powder. This transformation is related to

1. a change in the partial pressure of oxygen in the air
2. a change in the crystalline structure of tin
3. an interaction with nitrogen of the air at very low temperature
4. an interaction with water vapour contained in the humid air

Correct answer: a change in the crystalline structure of tin

Solution

The correct option is related to the fact that the tin buttons underwent a transformation in their crystalline structure due to the extreme cold, which can lead to a phenomenon known as tin pest, where tin changes from a metallic form to a powdery form.

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