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On strong heating of borax, a transparen...

On strong heating of borax, a transparent glassy mass is obtained as a mixture of

A

`Na_(2) B_(4) O_(7) +NaBO_(2)`

B

`NaBO_(2) + B_(2)O_(3)`

C

`Na_(2)B_(4)O_(7) + B_(2) O_(3)`

D

`Na_(3)BO_(3) + NaBO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
On strong heating, a transparent, glass mass is obtained as residue. This borax is called borax glass. It is composed of boric anhydride and sodium mataborate
`Na_(2)B_(4)O_(7)*10H_(2)Ounderset(("swells up"))to Na_(2) B_(4) O_(7) + 10 H_(2) O`
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