CBSE Class 12 Chemistry 2022 Term 2 Delhi Set 3

Question : 6 of 12

Marks: +1, -0

(a) Using Valence Bond theory, predict the hybridization and magnetic character of following:

[ {\CoF}_6] ^{3-}

[Atomic number of

{\Co}=27]

(b) Write IUPAC name of the following complex:

[ {\CoBr}_2( {\en})_2] ^{+}

[ {\Co} ( {\NH}_3) _6] {\Cl}_2

in solution?

Solution:

(a)

[ {\CoF}_6] ^{3-}

\;\text " Hybridization "\;\;=s p^3 d^2

\;\text " Magnetic Nature "\;\;=\;\text " Paramagnetic "\;

(b)

[ {\CoBr}_2( {\en})_2] ^{+}

IUPAC name of the complex is Dibromidobis(ethane-1,2 -diamine) cobalt(III) ion.
(c) In aqueous solution of the complex, 3 ions are produced.

[ {\Co} ( {\NH}_3) _6] {\Cl}_2 ⇌ [ {\Co} ( {\NH}_3) _6] ^{+2}+2 {\Cl}^{-}

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