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Arrange in increasing order of extent of hydrolysis [ CCI4, MgCI2, AICI3, PCl5, SiCI4].

We know that CCI4 does not undergo hydrolysis since "C" does not have d orbital. The central atom of all other element contains empty d-orbitals and hence undergoes hydrolysis. As the oxidation state of the central atom increases from +2 (MgCI2) to +3 (AICI3) to +4 (SiCI4) to +5 (PCl5), the extent of hydrolysis increases accordingly. Thus, the overall increasing order of extent of hydrolysis follows the order: 
                           ["CCI4 < MgCI2 < AICl3 < SiCl4 < PCl5"]

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What are the SESQUI OXIDES ? give the examples.

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