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Q.

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 six electrical charges. The formula of the compound is :

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a

$Co {({NO}_{2})}_{3} \cdot 2 {KNO}_{2}$

b

$Co {({NO}_{2})}_{3} \cdot 3 {KNO}_{2}$

c

$K_{3} [Co {({NO}_{2})}_{6}]$

d

$K [Co {({NO}_{2})}_{4}]$

answer is C.

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Detailed Solution

$\begin{array}{l} Co {({NO}_{2})}_{3} + 3 {KNO}_{2} \to K_{3} [Co {({NO}_{2})}_{6}] \\ K_{3} [Co {({NO}_{2})}_{6}] ⇌ 3 K^{+} + {[Co {({NO}_{2})}_{6}]}^{3 -} (four ions) \\ K_{3} [Co {({NO}_{2})}_{6}] \to 3 K^{+} + {[Co {({NO}_{2})}_{6}]}^{3 -} \end{array}$

Hence correct option is C.

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