The value of $^{'} x^{'}$ in the complex $H_{x}[Co(CO)_{4] $(o n t h e b a s i s o f E A N r u l e); a n d g e o m e t r y a r r o u n d$ Co$ ion respectively is

1

, square planar

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2

, tetrahedral

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1

, tetrahedral

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2

, square planar

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Solution

The correct option is C $1$ , tetrahedral
$E A N = Z - X + Y$
Z $=$ Atomic number of the metal
X $=$ Number of electrons lost during the formation of the metal ion from its atom
Y $=$ Number of electrons donated by the ligands
For $[C o (C O)_{4}]^{-}$
$E A N = Z - X + Y = 27 + 1 + 8 = 36$
Thus EAN rule is followed.
Thus value of x in $H_{x} [C o (C O)_{4}]$ is 1.
The geometry of the molecule is tetrahedral.

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