1.

Na_(2)B_(4)O_(7).10H_(2)O can also be represented as

Answer»

`Na_(2) [B_(4) O_(5) (OH)_(4)].8H_(2)O`
`2NaBO_(2) .Na_(2)B_(2)O_(3).10H_(2)O`
`Na_(2)[B_(4)(H_(2)O)_(4).O_(7)].6H_(2)O`
All the above

Solution :`Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O""` (or)
`Na_(2)B_(4)O_(7).10H_(2)O`
`B_(2)H_(6)+2NH_(3)overset(120^@C)rarrB_(2)H_(6).2NH_3`


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