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On heating, borax first swells up by losing water molecules. On further heating it changes to transparent liquid which solidifies to glass like material known as borax bead. In the following equation, supply the formulae of compounds. A and B respectively.
${Na}_{2} B_{4} O_{7} \cdot 10 H_{2} O ⟶ {Na}_{2} B_{4} O_{7} \to A + B$

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Na₂B₂O₄,B₂O₄

NaBO₂,B₂O₃

Na₂B₂O₄,B₄O₆

NaBO₂,B₄O₆

answer is B.

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Detailed Solution

${Na}_{2} B_{4} O_{7} \cdot 10 H_{2} O ⟶ {Na}_{2} B_{4} O_{7} \to \underset{Sod. metaborate}{2 {NaBO}_{2}} + \underset{Boric anhydride}{B_{2} O_{3}}$

metaborates of many transition metals have characteristic colour ,so borax bead test is used to identify them .

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