5. With the help of what reactions can the next cycle of rotations be carried out? Write the reactions in molecular and ionic forms:
a) CuCl2 → Cu(OH)2 → CuSO4 → ZnSO4 → Na2ZnO2;
b) Fe(NO3)3 → FeOH(NO3)2 → Fe(OH)3 → FeCl3 → Fe(NO3)3;
c) Al2O3 → AICl3 → Al(OH)3 → NaAlO2 → NaNO3.

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