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The borax bead is 

Option: 1

Na_2B_4O_7


Option: 2

Na_2BO_3


Option: 3

NaBO_2+B_2O_3


Option: 4

NaBO_2


Answers (1)

best_answer

As we have learned

Action of heat on borax -

Loses its water of crystallisation and form swollen fluffy mass. Further heating melts it to give transparent glassy bead consisting of sodium metaborate (NaBO2) and boric anhydride (B2O3)

Na_{2}B_{4}O_{7}\cdot 10H_{2}O \xrightarrow[-H_{2}O]{\Delta }Na_{2}B_{4}O_{7}\overset{\Delta }{\rightarrow}2NaBO_{2}+B_{2}O_{3}

Therefore, option (3) is correct.

Posted by

jitender.kumar

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