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551. What is the oxidation state of phosphorus in the following: (a) H₃PO₃, (b) PCl₃ (c) Ca₃P₂, (d) Na₃PO₄, (e) POF₃?

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552. Write balanced equations for the following:
NaCl is heated with sulphuric acid in the presence of MnO_2.

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553. Write balanced equations for the following:
Chlorine gas is passed into a solution of NaI in water.

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554. How are xenon fluorides XeF_2,XeF₄ and XeF₆ obtained?

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555. With what neutral molecule is CIO^– isoelectronic? Is that molecule a Lewis base?

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556. How are XeO₃ and XeOF₄ prepared?

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557. Arrange the following in the order of property indicated for each set:
F₂, Cl₂, Br₂, I₂ – increasing bond ethalpy.

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558. Arrange the following in the order of property indicated for each set:
HF, HCl, HBr, HI - increasing acid strength

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559. Arrange the following in the order of property indicated for each set:
NH₃ PH₃ AsH₃ SbH₃ BiH₃ – increasing base strength.

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560. Give the formula and describe the structure of a noble gas species which is isostructural with
(a) ICl₄^– (b) IBr₂^– (c) BrO₃^–

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