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-p-Block elements - I — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry-p-Block elements - I1 Mark
MCQ
Soldiers of Napolean 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
  • A
    A change in the partial pressure of oxygen in the air
  • ✓
    A change in the crystalline structure of tin
  • C
    An interaction with nitrogen of the air at very low to temperatures
  • D
    An interaction with water vapour contained in the humid air
✓

Answer

Correct option: B.
A change in the crystalline structure of tin
b
(b) Grey tin is very brittle and easily crumbles down to a powder in very cold climates.

$\mathop {{\rm{Grey tin}}}\limits_{{\rm{(Cubic)}}} $ $ \rightleftharpoons $  $\mathop {{\rm{White tin}}}\limits_{{\rm{(Tetragonal)}}} $

The change of white tin to grey tin is accompanied by increase in volume. This is called tin disease or tin plague.

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