Which of the following options provides the correct explanation for why FeSO 4 solution mixed with (NH 4 ) 2 SO 4 solution in a 1:1 molar ratio gives the test for Fe 2+ ion but CuSO 4 solution mixed with aqueous ammonia in a 1:4 molar ratio does not give the test for Cu 2+ ion?

Options

1. A(NH 4 ) 2 SO 4 forms a double salt with FeSO 4 ions, making them completely detectable, while CuSO 4 forms a c
2. BCu 2+ ions are more reactive with aqueous ammonia than Fe 2+ ions, which prevents the formation of a complex,
3. CFe 2+ ions have a higher tendency to form coordination complexes with (NH 4 ) 2 SO 4 , resulting in a testable
4. DThe molar ratio does not affect the detection of metal ions, as both Fe 2+ and Cu 2+ ions can be detected unde