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(C) When a concentrated solution of $Co(NO_3)_2$ reacts with $NaNO_2$ in $50\%$ acetic acid,the hexanitritocobaltate$(III)$ complex ion,$[Co(NO_2)_6]^

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Potassium

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(C) When a concentrated solution of $Co(NO_3)_2$ reacts with $NaNO_2$ in $50\%$ acetic acid,the hexanitritocobaltate$(III)$ complex ion,$[Co(NO_2)_6]^{3-}$,is formed.Upon adding a salt containing the potassium ion $(K^+)$,a yellow precipitate of potassium hexanitritocobaltate$(III)$,$K_3[Co(NO_2)_6]$,is produced.This reaction is a standard qualitative test for the identification of potassium ions.Therefore,metal $M$ is potassium $(K)$.

$A$ solution is prepared by mixing a concentrated solution of $Co(NO_3)_2$ with a concentrated solution of $NaNO_2$ in $50\%$ acetic acid. $A$ solution of a salt containing metal $M$ is added to the mixture,and a yellow precipitate is formed. Metal $M$ is:

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