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Question

The overall charge present on the cyclic silicate anion [Si6O18]n is:

A
-24
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B
-12
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C
-18
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D
-6
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Solution

The correct option is A -12
Cyclic silicate : If two oxygen atoms per tetrahedron are shared to form closed rings. The structure with general formula (SiO23)n or (SiO3)2nn
Comparing cyclic silicate anion [Si6O18]n with (SiO3)2nn, n=6.
thus overall charge on cyclic silicate anion = 2n=2×6=12.
Hence correct option is b.

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