Q. Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. While metallic tin buttons got converted to grey powder. This transformation is related to
A) An interaction with nitrogen of the air at very low to 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
Explanation
(c)
Grey tin is very brittle and easily crumbles down to a powder in very cold climates Grey tin $=$ white tin
(cubic) (tetragonal)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.