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Borax Formula - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main
Quick Facts
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Borax is considered one the most difficult concept.
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30 Questions around this concept.
Solve by difficulty
When borax is heated with on a platinum loop, blue-coloured bead formed, largely due to
What is the pH of a 1% solution of Borax?
During the borax bead test with , a blue green colour of the bead was observed in oxidising flame due to the formation of
The anionic unit of borax is:
The aqueous solution of borax is
Which of the following is not a mineral of Boron?
The number of electrons in ground state electronic configuration of Boron for which $l=1$
Borax bead contains
Hydrolysis of $\mathrm{BCl}_3$ gives X which on treatment with sodium carbonate produces Y, X and Y, respectively, are
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Concepts Covered - 0
Borax
It is the most important compound of boron. It is a white crystalline solid of formula Na2B4O7⋅10H2O. In fact, it contains the tetranuclear units [B4O5(OH)4]2-and correct formula; therefore, is . Borax dissolves in water to give an alkaline solution.
On heating, borax first loses water molecules and swells up. On further heating it turns into a transparent liquid, which solidifies into glass like material known as borax bead.
The metaborates of many transition metals have characteristic colours and, therefore, borax bead test can be used to identify them in the laboratory. For example, when borax is heated in a Bunsen burner flame with CoO on a loop of platinum wire, a blue coloured
Co(BO2)2 bead is formed.
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