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When boric acid reacts with sodium carbo...

When boric acid reacts with sodium carbonate a white crystaline solid X is formed which on heating above 750 C gives

A

`Na_2B_2O_5 + B_2O_3`

B

`Na_2B_4O_7`

C

`NaBO_2 + Na_2BO_3`

D

`NaBO_2 + B_2O_3`

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