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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2016 · Mains Paper III

Q5(a). Interstitial carbon in iron

Question

Carbon in fcc iron has density 8.105 g cm⁻³ and unit-cell edge 3.589 Å. Is carbon interstitial or substitutional? Calculate its mass percentage.

Answer in brief

Carbon is interstitial; its calculated mass fraction is approximately 1.00%.

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CoversInterstitial carbon in ironSolid-state analysis

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