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underset(("Swollen white mass"))(Na(2)B(...

`underset(("Swollen white mass"))(Na_(2)B_(4)O_(7).XH_(2)O)overset(60^(@)C)rarr underset(("Glassy mass"))(Na_(2)B_(4)O_(7).YH_(2)O)overset(Delta)rarr Na_(2)B_(4)O_(7).ZH_(2)O overset(Delta)rarr B_(2)O_(3)+2NaBO_(2)`, then the valsue of `(x-y+z)` is

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The correct Answer is:
5
`Na_(2)B_(4)O_(7).10H_(2)Ooverset(60^@C)rarrNa_(2)B_(4)O_(7).5H_(2)Ooverset(Delta)rarr`
`Na_(2) B_(4)O_(7) overset(Delta) rarr 2NaBO_(2) +B_(2)O_3`
x = 10, y = 5 , z = 10
x - y + z = 10 - 5 + 0 = 5
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