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Give two examples to show the anomalous ...

Give two examples to show the anomalous behaviour of flurine.

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The two anomalous behaviour of flourine are as follows :
a) It forms only one oxo-acid while other haloggens form a number of oxo-acids.
b) Hydrogen flouride (HF) is a liquid (b.p. 293 K) due to strong hydrogen bonding whereas other hydrogen halides are gases.
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