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A compound of boron, A on heating swells...

A compound of boron, A on heating swells up which on further heating forms glassy transparent mass `B`. The chemical constituent `B` is/are

A

`Na_2 B_4 O_7` only

B

`NaBO_2` only

C

`NaBO_2 + B_2 O_3`

D

`Na_2 B_4 O_7 + B_2 O_3`

Text Solution

Verified by Experts

The correct Answer is:
C
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