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Question
How will you identify borate radical?
Solution
When boric acid or borate salt is heated with ethyl alcohol in presence of concentrated H2SO4, an ester triethyl borate is formed. The Vapour of this ester burns with a green-edged flame and this reaction is used to identify the presence of borate.
\[\ce{4H3BO3 + 3C2H5OH ->[con. H2SO4] \underset{\text{(Triethyl borate)}}{B(OC2H5)3} + 3H2O}\]
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RELATED QUESTIONS
Boric acid is an acid because its molecule ____________.
Which among the following is not a borane?
Match items in Column – I with the items of Column – II and assign the correct code.
| Column – I | Column – II |
| A. Borazole | 1. B(OH)3 |
| B. Boric acid | 2. B3N3H6 |
| C. Quartz | 3. Na2[B4O5(OH)4]8H2O |
| D. Borax | 4. SiO2 |
Complete the following reaction.
\[\ce{Na2B4O7 + H2SO4 + H2O ->}\]
Complete the following reaction.
\[\ce{B2H6 + 2NaOH + 2H2O ->}\]
Complete the following reaction.
\[\ce{BF3 + 9H2O ->}\]
Complete the following reaction.
\[\ce{B + NaOH ->}\]
Complete the following reaction.
\[\ce{H2B4O7 ->[Red hot]}\]
How will you convert boric acid to boron nitride?
A double salt which contains fourth-period alkali metal (A) on heating at 500 K gives (B). aqueous solution of (B) gives white precipitate with BaCl2 and gives a red colour compound with alizarin. Identify A and B.
