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  4. The effective atomic number of central Cu (at. no. 29) metal in [ Cu ( NH 3)4] SO 4 is

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Q. The effective atomic number of central $Cu$ (at. no. $29$) metal in $\left[ Cu \left( NH _{3}\right)_{4}\right] SO _{4}$ is

ManipalManipal 2017

Solution:

$EAN$ of $Cu$ in $\left[ Cu \left( NH _{3}\right)_{4}\right] SO _{4}$ is as
$EAN = Z -( O . N .)+2( C . N .)$
$EAN =29-2+4 \times 2=35$