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Which of the following is not isostructural with SiCl4?

1. SO42−
2. PO43−
3. NH4+
4. SCCl4

Correct answer: SCCl4

Solution

SiCl4, SO42−, PO43−, and NH4+ all have tetrahedral geometry, but SCCl4 has a different structure due to the presence of a double bond in the central atom's bonding, making it not isostructural.

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