1.

The correct order of thermal stability of hydrogen halides (H-X) is :

Answer»

`HI gt HBr gt HCL gt HF`
`HF gt HCl gt HBr GTHI`
`HCl lt HF gt HBr gt HI`
`HI gt HCl gt HF gt HBr.`

Solution :Thermal stability is directly proportinal to BOND DISSOCIATION energy and bond dissociation energy is inversely proportinal to bond length. The decreasing order of bond dissociation energy is `HF gt HCl gt HBr gt HI`.


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