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A solution is made by a concentrated sol...

A solution is made by 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, when a yellow precipitate is formed. Metal 'M' is:

A

Magnesium

B

Sodium

C

Potassium

D

Zinc

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