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Q.

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.Na2 B4O7·10H2O⟶Na2 B4O7→A+B

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a

Na2B2O4,B2O4

b

NaBO2,B2O3

c

Na2B2O4,B4O6

d

NaBO2,B4O6

answer is B.

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Detailed Solution

Na2 B4O7·10H2O⟶Na2 B4O7→2NaBO2 Sod. metaborate +B2O3 Boric anhydride metaborates of many transition metals have characteristic colour ,so borax bead test is used to identify them .
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