P->P2O5->H3PO4->CA(HPO4)->Ca3(PO4)2 AI->ALCI3->AI(OH)3->AL2(SO4)3->AI2(SO4)3->AI(NO3)3 Fe2O3->Fecl3->Fe(OH)3->Fe2(SO4)3

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You have listed the chemical reactions involving various elements and compounds in a sequential order. It appears to be a series of chemical reactions where the initial reactant undergoes different transformations to form new compounds. For example, in the first sequence, phosphorus (P) reacts with oxygen (O) to form P2O5, which further reacts to form phosphoric acid (H3PO4), and so on.Similarly, in the second sequence, aluminum (Al) reacts with chloride (Cl) to form AlCl3, and the reaction proceeds through different compounds until the final compound AI(NO3)3 is formed.These reactions demonstrate the chemical transformations that elements and compounds undergo under specific conditions to form different products.It is important to note that these reactions are based on chemical principles and can be used to understand the reactivity and behavior of different elements and compounds in laboratory experiments or industrial processes.