Borax bead is a mixture of

1.	Borax bead is a mixture of
Answer» `NaBO_2 + B_2 O_3` `Na_2 B_4 O_7 + B_2 O_3` `H_2 B_4 O_7 + B_2 O_3` `Na_2 B_4 O_7 + 10 H_2 O + B_2 O_3` ANSWER :A

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