NTA Abhyas NEET2020Chemistryp Block Elements (Group 13 & 14)Practice
The soldiers of Napoleon army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to
Options
- Aan interaction with nitrogen of the air at very low temperatures
- Ba change in the crystalline structure of tin
- Can interaction with water vapour contained in the humid air
- Da change in the partial pressure of oxygen in the air.
Correct answer
B. a change in the crystalline structure of tin
Step-by-step solution
As temperature decreases, white tin ( β - f o r m ) changes to grey tin ( α - f o r m ) α − Sn ⇌ 13.2 o C β − Sn α - S n has a much lower density then β - S n .