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प्रश्न
How will you identify borate radical?
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उत्तर
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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संबंधित प्रश्न
Which of the following metals has the largest abundance in the earth’s crust?
In diborane, the number of electrons that accounts for banana bonds is ____________.
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 |
Give the uses of Borax.
Describe the structure of diborane.
Give one example for the following.
Icosogens
Complete the following reaction.
\[\ce{BF3 + 9H2O ->}\]
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.
