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The answer is +7 because the oxygen has a charge of -8 and the charge on the whole compound is -1 therefore the charge on Cl must be +7.

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13y ago
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10y ago

If PCl4 existed P would have an oxidation number of +4. Real compounds of phosphorus and chlorine are PCl3 (P has oxidation number of +3) and PCl5 (P has oxidation number of +5)

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11y ago

+7 for Cl

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14y ago

It is +7.

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Q: What is the oxidation number of Cl in PCl4?
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