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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

Q3(a). Iron reported as ferric oxide

Question

A 0.4891 g ore sample, with its iron reduced to Fe(II), requires 36.92 mL of 0.02153 M dichromate. Report iron as Fe₂O₃ percentage.

Answer in brief

77.86% w/w as Fe₂O₃. The printed request for w/v cannot be determined for this solid sample without a volume.

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CoversIron reported as ferric oxideRedox analysis

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