The structural unit present in pyrosillicates is:....

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The structural unit present in pyrosillicates is:
(1) \( \mathrm{Si}_{3} \mathrm{O}_{9}^{6-} \)
(2) \( \mathrm{SiO}_{4}^{4-} \)
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(3) \( \mathrm{Si}_{2} \mathrm{O}_{7}^{6-} \)
(4) \( \left(\mathrm{Si}_{2} \mathrm{O}_{5}^{2-}\right)_{\mathrm{n}} \)


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