Chemical Sciences Transition Elements and Inner Transition Elements

Reaction of an aqueous acidic solution of CoCl2 with KNO2 gives a yellow precipitate X and with NH4SCN, a blue-colored compound Y. Compounds X and Y, respectively, are

1
K4Co(NO2)6 and Co(SCN)2
2
K3Co(NO2)6 and Co(SCN)2
3
K3Co(NO2)6 and (NH4)2Co(SCN)4
4
K4Co(NO2)6 and (NH4)2Co(SCN)4

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