Question:
Identify the reactions which give orthoboric acid from the following:
\[
\text{I. Acidification of an aqueous solution of borax}
\]
\[
\text{II. Hydrolysis of diborane}
\]
\[
\text{III. Hydrolysis of boron trichloride}
\]
Identify the reactions which give orthoboric acid from the following:
\[
\text{I. Acidification of an aqueous solution of borax}
\]
\[
\text{II. Hydrolysis of diborane}
\]
\[
\text{III. Hydrolysis of boron trichloride}
\]
Show Hint
Borax, diborane and boron trichloride are all important laboratory sources of orthoboric acid.
Updated On: Jun 18, 2026
- I, II only
- II, III only
- I, III only
- I, II, III
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
Orthoboric acid \((H_3BO_3)\) can be prepared by several methods involving boron compounds.
Step 1: Acidification of borax solution.
\[ Na_2B_4O_7 + 2HCl + 5H_2O \rightarrow 4H_3BO_3 + 2NaCl \] Thus orthoboric acid is formed. Statement I is correct.
Step 2: Hydrolysis of diborane.
\[ B_2H_6 + 6H_2O \rightarrow 2H_3BO_3 + 6H_2 \] Orthoboric acid is produced. Statement II is correct.
Step 3: Hydrolysis of boron trichloride.
\[ BCl_3 + 3H_2O \rightarrow H_3BO_3 + 3HCl \] Orthoboric acid is again formed. Statement III is correct. Hence, \[ \boxed{\text{I, II and III}} \]
Step 1: Acidification of borax solution.
\[ Na_2B_4O_7 + 2HCl + 5H_2O \rightarrow 4H_3BO_3 + 2NaCl \] Thus orthoboric acid is formed. Statement I is correct.
Step 2: Hydrolysis of diborane.
\[ B_2H_6 + 6H_2O \rightarrow 2H_3BO_3 + 6H_2 \] Orthoboric acid is produced. Statement II is correct.
Step 3: Hydrolysis of boron trichloride.
\[ BCl_3 + 3H_2O \rightarrow H_3BO_3 + 3HCl \] Orthoboric acid is again formed. Statement III is correct. Hence, \[ \boxed{\text{I, II and III}} \]
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