The effective atomic number of Mn,in $M n_{2} (C O)_{10}$ is _____.

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Solution

The correct option is C 36
The formula for effective atomic number(EAN) is => Z - O.S + 2CN
here,
Z=atomic number
O.S=oxidation state
CN=coordination number
So, FOR 2 Mn
Z=2×25
O.S=0
CN=10 (for 10 CO ) + 1 (for 1 Mn-Mn sigma bond)
Thus CN = 11
EAN = 2×25 - 0 + 11×2
50+ 22
72
Thus 72 for 2 Mn
or 72/2 for 1Mn
= 36

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