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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper II covers chemistry.

UPSC Combined Geo-Scientist, Prelims · 2020 · Paper II, Chemistry · Q23 of 120

Geo-Scientist Prelims 2020 Chemistry Q23: The denticity of ligands glycinate, iminodiacetic acid and…

QuestionCoordination / denticity

The denticity of ligands glycinate, iminodiacetic acid and nitrilotriacetic acid are:

  1. (a) 2, 3 and 4 respectively
  2. (b) 3, 3 and 4 respectively
  3. (c) 2, 3 and 3 respectively
  4. (d) 1, 2 and 3 respectively

Answer: (a) 2, 3 and 4 respectively

Glycinate NH₂CH₂COO⁻ binds via N and O → 2. Iminodiacetate HN(CH₂COO⁻)₂: N + 2 O → 3. Nitrilotriacetate N(CH₂COO⁻)₃: N + 3 O → 4 → (a).

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