1.

Colemanite is :

Answer»

`Na_(2)B_(4)O_(7).10H_(2)O`
`Na_(2)B_(6)O_(11).5H_(2)O`
`NaBO_(2)`
`H_(3)BO_(4)`

SOLUTION :Colemanite is ORE of boron with formula `Na_(2)B_(6)O_(11).5H_(2)O`.


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