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The p-Block Elements

Short Answer Type

471. How will you prepare hyrogen iodide?

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472. Why HF has abnormally high melting and boiling points?

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473. HF can not be stored in glass bottles. What is the reason for this?

HF cannot be stored in glass bottles because it combines with glass (SiO₂) to form soluble complex H₂SiF₆.

8 HF + N a_{2} {SiO}_{2} \to H_{2} {SiF}_{6} + 3 H_{2} O + 2 N a F

{SiF}_{4} + 2 HF \to \underset{Soluble}{H_{2} {SiF}_{6}}

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474. What happens when sulphur dioxide is passed through an acidic solution of sodium chlorate?

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475. What is the structure of Cl₂O?

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476. Oxygen is sp³ hybridised in both H₂O and Cl₂O, but in H₂O, the bond angle is 104° while in Cl₂O, the bond angle is 112°. Account for this difference in the value of bond angle.

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477. Give two uses of chlorine dioxide (ClO₂).

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478. Explain why fluorine form only one oxoacid, HOF.

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479. How will you prepare pure hypo-chlorus acid?

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480. Arrange the following in order of decreasing basic strength:
(a) HCIO, HCIO₂, HClO₃, HClO₄(b) HOCl, HOBr, HOI

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