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