H_(3)BO_(3)overset("Red heat")rarr- X. 'X' in the reaction is

1.	H_(3)BO_(3)overset("Red heat")rarr- X. 'X' in the reaction is
Answer» `H_(2)B_(4)O_7` `HNO_2` `B_2O_3` B Solution :`2H_(3)BO_3overset("Red HEAT")rarrB_(2)O_3+3H_(2)O`

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