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Exam
Olympiad workbook
Subject
NSEC
Chapter
Chemical Equilibrium

Olympiad workbook · NSEC · Chemical Equilibrium

Eriochrome black T (EBT) is an indicator in titrimetric estimation...

Eriochrome black T (EBT) is an indicator in titrimetric estimation of calcium at pH 10.0 giving pink colour to the solution. It has structure as shown below. Considering that the pH of solution is 10.0 , which statement(s) describe(s) the complexation of EBT with Ca (II) correctly Eriochrome black T (EBT) is an indicator in titrimetric estimation of calcium at pH 10.0 giving pink colour to the

Options

  1. AOn dissociation of EBT, Ca (II) binds at SO3−\mathrm{SO}_3{ }^{-}to form 1:21: 2 complex
  2. BBoth sulphonate and nitro groups are involved in 1:1 complexation with Ca (II)
  3. CEBT acts as a bidentate ligand to form a dianionic species, with deprotonation of one-OH, where Ca (II) binds to azide nitrogen and phenolic oxygen trans to −NO2-\mathrm{NO}_2 group in 1:2 ratio
  4. DThere is a mixture of complexes of Ca (II) with EBT acting as a bidentate and tridentate ligand

Correct answer

D. There is a mixture of complexes of Ca (II) with EBT acting as a bidentate and tridentate ligand

Step-by-step solution

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