Question

Which of the following is not obtained by heating hydrated borax, Na2B4O7.10H2O?

(A) Na2B4O7(anhydrous)
(B) NaBO2
(C) B2O3
(D) NaBO3

Answer 1

NaBO2

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Answer 2

Answer:

$Na(BO_3)$ is not obtained by heating hydrated borax.

Explanation:

$Na_2B_4O_7.10H_2O \longrightarrow Na_2B_4O_7 \longrightarrow 2NaBO_2+B_2O_3$

$Na_2B_4O_7 \longrightarrow Borax\\NaBO_2 \longrightarrow Sodium metaborate\\B_2O_3 \longrightarrow Boric anhydride$

When hydrated borax is heated anhydrous borax is formed on further heating Sodium metaborate and Boric anhydride.

$Na(BO_3)$ is not formed in the process of heating hydrated borax.