The valency of the cuprammonium ion is

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(B) The cuprammonium ion is represented as $[Cu(NH_3)_4]^{2+}$.In this complex ion,the central metal atom is copper $(Cu)$ and the ligand is ammonia $

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$+2$

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(B) The cuprammonium ion is represented as $[Cu(NH_3)_4]^{2+}$.In this complex ion,the central metal atom is copper $(Cu)$ and the ligand is ammonia $(NH_3)$.Since $NH_3$ is a neutral ligand,the charge on the complex ion is equal to the oxidation state of the central metal ion.Therefore,the valency (oxidation state) of copper in the cuprammonium ion is $+2$.

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