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The d- and f-Block Elements
Variable Oxidation States of Transition Elements
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Concepts tested
- Variable valency of iron
All Questions
2004 AIPMT 1 question
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Among K, Ca, Fe and Zn, the element which can form more than one binary compound with chlorine is :-An element forms more than one binary chloride only if it shows more than one stable oxidation state.
K (alkali metal) shows only +1: KCl.
Ca (alkaline earth metal) shows only +2: $CaCl_2$.
Zn has a completely filled $3d^{10}$ configuration and shows only +2: $ZnCl_2$.
Fe ($[Ar]\,3d^6\,4s^2$) is a transition element with variable oxidation states +2 and +3. It forms $FeCl_2$ (ferrous chloride) and $FeCl_3$ (ferric chloride).
So the element is Fe.