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Question

Metal carbonyls having formula $$ M(CO)_x $$ , where $$ x $$ is the number of carbonyl units co- ordinated to metal $$ M $$ are formed by $$ Fe , Cr $$ and $$ Ni $$ . If effective atomic number of each metal is $$ 36 $$ , what are the formula of metal carbonyls ? 


Solution

$$ M(CO)_x $$ 

In     $$ Fe(CO)_x : $$                 EAN = Atomic no. of $$ Fe - oxidation\ state\ \ of \ metal+ 2 \times $$ No. of ligands ,i.e., $$ CO $$ 

 $$\displaystyle \therefore $$                                            $$ 36 = 26-0  + 2.x $$ 

 $$\displaystyle \therefore $$                                                $$ x = 5 $$ 
 
 $$\displaystyle \therefore $$            Formula of iron carbonyl is $$ Fe(CO)_5 $$ 

 Similarly ,     $$ Cr(CO)_6 $$ and $$ Ni(CO)_4 $$ 


Chemistry

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