Which of the following cations will form yellow precipitate with sodium cobaltinitrite?

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$K^{+}$

${Ba}^{2 +}$

${Mg}^{2 +}$

${Ca}^{2 +}$

answer is A.

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Detailed Solution

potassium cations will form yellow precipitate with sodium cobaltinitrite

A metal salt solution produces a white precipitate with diluted sulfuric acid and a yellow precipitate with potassium chromate in acetic acid, but not a precipitate with sodium chloride or iodide. When sodium carbonate is added to the metal salt solution, a white precipitate is produced that is made up of

Hence option A is correct

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