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The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are $x$, $y$ and $z$. The sum of $x$, $y$ and $z$ is ____.
$\text{Na}_4[\text{Fe(CN)}_5(\text{NOS})]$ (A), $\text{Na}_4[\text{FeO}_4]$ (B), $[\text{Fe}_2(\text{CO})_9]$ (C)
In A: $x = +2$; In B: $y = +4$; In C: $z = 0$. Sum $= 2 + 4 + 0 = 6$.
BETA
