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When Borax is heated it forms a colourless glassy bead because of formation of :
A. `B_(2)H_(6)`
B. `NaBO_(2)`
C. `B_(2)O_(3)`
D. `Na_(2)B_(4)O_(7)`

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Correct Answer - B::C
`Na_(2)B_(4)O_(7). 10H_(2)O overset(Delta)to Na_(2)B_(4)O_(7) overset(Delta)to underset("glassy bead")(2NaBO_(2))+B_(2)O_(3)`

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