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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Redox Reactions

NTA Abhyas 2020 · Chemistry · Redox Reactions

Aqueous solution of orthoboric acid can be titrated against sodium...

Aqueous solution of orthoboric acid can be titrated against sodium hydroxide using phenolphthalein indicator only in presence of:

Options

  1. Atrans-glycerol
  2. Bcatechol
  3. Ccis-glycerol
  4. Dboth (B)\left(B\right) and (C)\left(C\right)

Correct answer

D. both (B)\left(B\right) and (C)\left(C\right)

Step-by-step solution

It forms a stable cyclic complex with polyhydroxy compounds like cis-glycerol, catechol, etc. This helps in the release of H+asH3O+H^{+}as{H}_{3}O^{+}& therefore, boric acid acts as a strong acid and hence can be titrated with sodium hydroxide using phenolphthalein.
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