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  4. The value of n in the molecular formula Be n Al 2 Si 6 O 18 is

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Q. The value of $n$ in the molecular formula $Be _{ n } \,Al _{2} \,Si _{6}\, O _{18}$ is ______

JEE AdvancedJEE Advanced 2010

Solution:

$Be _{3} Al _{2} Si _{6} O _{18}$ (Beryl)
(according to charge balance in a molecule)
$2 n +6+24-36=0 $
$n =3$