Oxygen is sp3 hybridised in both H2O and Cl2O, but in H2O, t

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 Multiple Choice QuestionsShort 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?
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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.


In Cl2O, the bond angle is 112° due to the repulsions between the bulky large size Cl atoms and oxygen atom. In H2O, the bond angle is 104° due to lone pair-lone pair repulsions. 
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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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