(i) Why do compounds having similar geometry have different magnetic moment ? (ii)$FeSO_4$ solution mixed with $(NH_4)_2SO_4$ solution in 1 : 1 molar ratio gives the test of $Fe^{2+}$ ion but $CuSO_4$ solution mixed with aqueous ammonia in 1 : 4 molar ratio does not give the test of $Cu^{2+}$ ion. Explain why ?

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