{FeSO₄ solution mixed with {(NH₄)₂SO₄ ...

NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

Question : 2 of 43

Marks: +1, -0

\mathrm{FeSO_4}

solution mixed with

\mathrm{(NH_4)_2SO_4}

solution in 1:1 molar ratio gives the test of

\mathrm{Fe}^{2+}

ion but

\mathrm{CuSO_4}

solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of

\mathrm{Cu}^{2+}

ion. Explain why?

Solution:

\mathrm{FeSO_4}

solution when mixed with

\mathrm{(NH_4)_2SO_4}

solution in 1:1 molarratio forms a double salt

\mathrm{FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O}

which when dissolvedin water dissociates into simple ions to give tests for its constituent ions.When

\mathrm{CuSO_4}

is mixed with aqueous ammonia a complex ion

\mathrm{[Cu(NH_3)_4]^{2+}}

is formed which does not give

\mathrm{Cu}^{2+}

in the solution.

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