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PCl5 is known but PI5 is not known. Why?...

`PCl_5` is known but `PI5` is not known. Why?

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Verified by Experts

It is mainly due to the following two reasons.
(a) An element shows to highest oxidation state only when it is attached to the more electronegative element. Chlorine is much more electronegative than iodine.
(b) Atomic size of iodine is much larger than that of chlorine. It is quite impossible to accomodate five larger iodine atoms around phosphorus due to steric reasons.
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BETTER CHOICE PUBLICATION-THE P-BLOCK ELEMENTS-QUESTION BANK
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  2. Write the chemical equations when: Zinc reacts with cone. HNO3

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  3. PCl5 is known but PI5 is not known. Why?

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  4. NCl3 is readily hydrolysed while NF3 does not. Explain.

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  5. NH3 is a strong base but NF3 does not show any basic property. Why?

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  7. Why nitric acid acts as an oxididing agent? How it oxidises: Ferrous S...

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  10. Sulphur show +4 and +6 oxidation stae in their compounds but oxygen ca...

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  11. Why SF6 is known but OF6 is not known

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  12. Explain why H2O is a liquid but H2S is a gas at room temperature.

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  14. Why is H2S less acidic than H2 Te ?

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  15. Why H 2 S is acidic wliile H2 O is nentral ?

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  16. Why is H2S less acidic than H2 Te ?

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