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The value of n in the molecular formula ...

The value of n in the molecular formula `Be_(n)Al_(2)Si_(6)O_(18)` is:

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The correct Answer is:
3
`Be_(n) Al_(2)Si_(6)O_(18)`. The value of n=3 by charge balancing.
`(Be^(2+))_(3) (Al^(3+))_(2) (Si_(6)O_(18))^(12-)`
`[2xxn+2(+3) +(-12)=0 :. N=3]`.
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