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Borax Formula MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 25, 2023 25:24 PM | #NEET
Quick Facts
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Borax is considered one the most difficult concept.
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12 Questions around this concept.
Solve by difficulty
MEDIUMNumber of Boron atom(s) having sp3 hybridisation in borax molecule is:
Identify P, Q and R from the reactions given below, which involves the conversion of borax to boron in the crystalline form.
Borax $\xrightarrow{\mathrm{HCl}} \mathrm{P} \xrightarrow{\Delta} \mathrm{Q} \xrightarrow{\Delta}\mathrm{R}\xrightarrow{\mathrm{\Delta}}{}$ Boron
Study the given statements and identify the incorrect ones with respect to borax and accordingly mark correct option.
I). Aqueous solution of borax can be used as a buffer.
II) For titration against acids, it is a useful primary standard.
III) 1 mole of borax can be used as a buffer.
IV) There are two triangular $\mathrm{BO}_3$ units and two tetrahedral$\mathrm{BO}_4$ units.
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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 Na2[B4O5(OH)4].8H2O. 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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