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Q)
$K_4[Fe(CN)_6]$ can be used to detect one or more out of $Fe^{2+}, Fe^{3+}, Zn^{2+}, Cu^{2+}, Cd^{2+}$
(a) $Fe^{2+}, Fe^{3+}$
(b) $Fe^{3+}, Zn^{2+}, Cu^{2+}$
(c) All but $Fe^{3+}$
(d) All but $Fe^{2+}$
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