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Q.

Glassy bead is obtained by heating

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a

H3BO3

b

B2H6

c

Ca2B6O11

d

Na2B4O710H2O

answer is A.

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Detailed Solution

When borax powder is heated, it first swells due to loss of water in the form of steam but at 740oC  it becomes converted into colourless transparent borax bead.

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