(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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(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 $(K)$.

Class 12 Chemistry Principles Related to Practical Chemistry Wet Test for Basic Radical

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$A$ 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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A
Magnesium
B
Sodium
C
Potassium
D
Zinc

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$A$ 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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Assign $A$,$B$,$C$,$D$ from the given type of reaction.$Fe(OH)_3 \downarrow + NaOH(\text{excess}) \longrightarrow \text{No reaction}$

Of the following sulphides,which one is insoluble in dilute acids but soluble in alkalies?

When $H_2S$ is passed through a solution in $Group-II$ analysis,it sometimes becomes milky. This indicates the presence of:

The group reagent for the precipitation of group $II$ basic radicals in qualitative analysis is:

$A$ laboratory reagent imparts green colour to the flame. On heating with solid $K_2Cr_2O_7$ and conc. $H_2SO_4$,it evolves a red gas. Identify the reagent.

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Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$Fe(OH)_3 \downarrow + NaOH(\text{excess}) \longrightarrow \text{No reaction}$