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Question

A compound is made by mixing cobalt(III) nitrite and potassium nitrite solutions in the ratio of 1:3. The aqueous solution of the compound showed 4 particles per molecule whereas molar conductivity reveals the presence of 4 ions. The formula of the compound is:


Your Answer
A
Co(NO2)3.2KNO2
Your Answer
B
Co(NO2)3.3KNO2
Correct Answer
C
K3[Co(NO2)6]
Your Answer
D
K[Co(NO2)4]

Solution

The correct option is A K3[Co(NO2)6]
Co(NO2)3+3KNO2K3[Co(NO2)6]
K3[Co(NO2)6]aq.3K++[Co(NO2)6]3  (four  ions)

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