Question

The borax bead is chemically :

• A. B2O3
• B. Na2B4O7
• C. Na3BO3
• D. B2O3 + NaBO2

Answer 1

Answer: (D)

B2O3 + NaBO2

Answer 2

Na2B4O7 . 10H2O $\underset{- 10H_{2}O}{\overset{\quad 740^{0}C\quad}{\rightarrow}}$ 2NaBO2 + B2O3

(glassy bead)