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The value of n in the molecular fromula ...

The value of `n` in the molecular fromula ` Be_n Al_2Si_6 O_(18)`.

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The correct Answer is:
3
`Be_(n)Al_(2)Si_(6)O_(18)`
`:' nxx(-2)+2xx(+3)+6xx(+4)+18(-2)=0`
`:. n=-3`
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