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621. Complete the following chemical reaction equation:
XeF₄ + H₂O → __________

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622. Draw structures of the following species:
(i) H₂,S₂,O₇ (ii)NO₃–.

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623. Assign a reason for the following statement:
Phosphorus (P₄) is more reactive than nitrogen (N₂).

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624. Assign a reason for the following statement:
All the bonds in PCl₅ are not equal in length.

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Structural formula of ${BrF}_{3}$ :

Structural formula of ${XeF}_{2} :$

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626. The number of replaceable hydrogen in phosphorus acid is ________.

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627. In P₄O₁₀, the number of oxygen atoms bonded to each phosphorus atom is _________.

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628.

The basicity of phosphorus acid (H₃PO₃) is _____________.

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629.

Dehydration of conc. nitric acid with P₄O₁₀ yields __________.

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630. Ammonia is basic while phosphine is ___________ towards litmus.

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