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What are pseudohalides, polyhalides and ...

What are pseudohalides, polyhalides and pseudohalogens? 

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Pseudohalides are univalent negatively charged ions, which bchave like halides. eg : Cyanide, `CN^(-)`, thiocyanide, `SCN^(-)` , etc. 
Polyhalides are monovalent anions, formed by 3 or more halogen atoms. eg : `I_(3)^(-),ICl_(4)^(-)` etc.
Pseudohalogens are dimeric neutral units of pseudohalides. eg : Cyanogen, `C_(2)N_(2)`
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AAKASH SERIES-GROUP 17 ELEMENTS-EXERCISE - 3.2
  1. What are pseudohalides, polyhalides and pseudohalogens?

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  2. Why elements of group 17 are called halogens?

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  3. Write on the bonding and oxidation states of halogens.

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  4. Fluorine exhibits only - 1 oxidation state whereas other halogens exhi...

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  5. Which element brings about highest coordination number of elements? Wh...

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  6. Iodine exhibits basic properties. Explain.

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  7. Differentiate the products of water on reaction with fluorine and chlo...

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  8. Discuss the oxidation states of chlorine in its compounds.

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  9. Explain the trends in ionisation potential, electron affinity, electro...

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  10. Discuss the ease of formation of hydrogen halides. Write the trends in...

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  11. How do halogens react with water? Give chemical equations.

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  12. Discuss the difference in the reactions of halogens with cold dilute a...

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  13. Discuss the feasibility of oxidising halides, using halogens, sulphuri...

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  14. What are interhalogen compounds? Discuss on the types of these compoun...

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  15. Explain with suitable examples that the oxidation ability of halogens ...

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  16. With the help of Born-Haber cycle, explain the chemical reactivity of ...

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  17. The oxidation of fluoride is very difficult to perform. Why?

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  18. Iodine is liberated in the reaction between KI and Cu^(2+), but bromin...

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  19. Interhalogen compounds are more reactive than the corresponding haloge...

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  20. Phosphoric acid is preferred in place of sulphuric acid in the prepara...

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  21. Fluorine is called super halogen. Why?

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