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    The p-Block Elements
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    Why are halogens strong oxidising agents?
    Halogen redlily ready to  accept of an electron to complete its configuration like halogen.That is way halogen act as strong oxidising agent.
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    Why are halogens coloured?
    Almost all halogens are coloured. This is because halogens absorb radiations in the visible region. This results in the excitation of valence electrons to a higher energy level. Since the amount of energy required for excitation differs for each halogen, each halogen displays a different colour
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    Write the reactions of F2 and Cl2 with water.

    Fluorine reacts violently with water forming hydrogen fluoride, and liberates oxygen which is highly charged with ozone.
    (i) 2F2(g) + 2H2O(l) → 4H+ (aq) + 4F–(aq) + O2(g)

    Chlorine dissolves in water to some extent to give a green solution

    (ii) Cl2+ H2O →  HCI + HOCl 

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    Explain why inspite of nearly the same electronegativity, oxygen forms hydrogen bonding while chlorine does not.
    Formation of hydrogen bonding depend on the size of atom. smaller the size greater the hydrogen bonding.although the electronegtivity is same but Oxygen has smaller size than chlorine. Smaller size favours hydrogen bonding.
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    Which one of the following does not exist?
    • XeOF4
    • NeF2 
    • XeF2
    • XeF6

    B.

    NeF2 
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