Compose molecular and electronic equations for thermal decomposition reactions proceeding according to the schemes:
(NH4)2Cr2O7 → N2 Cr2O3 H2O
KClO3 → KClO4 KCl
CaSO4 → CaO SO2 O2
Indicate what type of redox reactions they belong to. Determine which substance or atom is an oxidizing agent and which is a reducing agent.

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