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"Colemanite"+Na(2)CO(3) to underset("Whi...

`"Colemanite"+Na_(2)CO_(3) to underset("White ppt".)((B))+(C)+(D)`
`(D) overset(CO_(2)) to (C)+Na_(2)CO_(3) overset("recrystallisation")toC'`
C' has only 8 water molecules of crystallisation Number of `sp^(3)` hybrised atoms in compound C'.

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The correct Answer is:
19
`C' to Na_(2)B_(4)O_(7).10H_(2)O or Na_(2) [B_(4)O_(5)(OH)_(4)].8H_(2)O`

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