The compound $K_{3} [C o {(N O_{2})}_{6}]$ is not called:

fischer salt

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potassium cobalt nitrate

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potassium hexanitrocobaltate (III)

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potassium cobalt nitrite

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Solution

The correct option is C potassium cobalt nitrate
Fischer salt is $K_{3} [C o {(N O_{2})}_{6}]$ and is also called as potassium hexanitrocobaltate (III)(hexa indicates the 6 nitrite groups).It is not called as potassium cobalt nitrate.
Hence options (they are nitrite groups not nitrate groups)
Hence option B is correct.

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