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Among K, Ca, Fe and Zn, the element which can form more than one binary compound with chlorine is:

1. Fe
2. Zn
3. K
4. Ca

Correct answer: Fe

Solution

Iron (Fe) can exhibit multiple oxidation states, such as +2 and +3, allowing it to form more than one binary compound with chlorine, like FeCl2 and FeCl3. The other elements do not exhibit such variability in oxidation states.

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