1.

The increasing order of acidity :

Answer»

HI `gt` HBr `gt `HCl` gt ` HF
`HClO_(4) gt HIO_(4) gt HBrO_(4)`
`HClOlt HIO lt HBRO`
`HClO_(4) gt HClO_(3) gt HCLO gt HClO_(2)`

Solution :In hydrides increase ACIDIC nature and increase atomic number `: HI gt HBr gt HCl gt HF`


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