A compound of boron, A on heating swells up which on further heating f – InterviewSolution

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1.	A compound of boron, A on heating swells up which on further heating forms glassy transparent mass B. The chemical constituent B is/are
Answer» `Na_2 B_4 O_7` only `NaBO_2` only `NaBO_2 + B_2 O_3` `Na_2 B_4 O_7 + B_2 O_3` ANSWER :C

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