(C) The compound $(NH_4)_2SO_4 \cdot Fe_2(SO_4)_3 \cdot 24H_2O$ is known as ferric ammonium alum. In this compound,iron exists in the $+3$ oxidation s

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(C) The compound $(NH_4)_2SO_4 \cdot Fe_2(SO_4)_3 \cdot 24H_2O$ is known as ferric ammonium alum. In this compound,iron exists in the $+3$ oxidation state $(Fe^{3+})$. Ferric salts,specifically those containing $Fe^{3+}$ ions,typically exhibit a pale violet or light purple colour in their crystalline form.