Deep blue colour formed by addition of copper (II) suphate solution to ethylamine is due to formation of
A. free `Cu^(2+)` ions in solution
B. `(NH_(4))_(2)SO_(4)`
C. `[Cu(C_(2)H_(5)NH_(2))_(4)]^(2+)` ions
D. `Cu(OH)_(2)`.

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Correct Answer - C
`Cu^(2+)+4C_(2)H_(5)NH_(2) rarr underset("(Deep blue complex)")underset("Tetraethylamine Copper (II) ion")([Cu(C_(2)H_(5)NH_(2))_(4)]^(2+))`

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