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What is the ratio between net charges of above structures?

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1:2

1:1

1:5

1:6

answer is A.

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Detailed Solution

$\begin{array}{l} {Si}_{3} O_{9}^{- 6} \to charge = - 6 - - - - (1) \\ {Si}_{6} O_{18}^{- 12} \to charge = - 12 - - - = - (1) \end{array}$
(1) : (2) = - 6 : –12
= 1 : 2

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