1.

{:("COLUMN-I","COLUMN-II"),((A)"Thermal stability",(p)H_(2)Te gt H_(2)Se gt H_(2)S gt H_(2)O),((B)"Acidic nature",(q)H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te),((C )"Boiling points",(r )H_(2)S lt H_(2)Se lt H_(2)Te lt H_(2)O),((D) angleM MH " Bond angle",(s) H_(2)S gt H_(2)Se gt H_(2)Te=H_(2)Po):}

Answer»


SOLUTION :A) Thermal stabilitydecreases as the size of chalcogen INCREASES `H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te`
B) As the size of chalgcogen increasesH-X bond strengthdecrease and gives `H^((+))` in aqueoussolution.`H_(2)Te gt H_(2)Se gt H_(2)S gt H_(2)O`
C) `H_(2)O` due to intermolecular H-bonding `:. H_(2)Te` - due to increase in molecular mass.
`:.` ORDER is `H_(2)S lt H_(2)Se lt H_(2)Te lt H_(2)O`
D) `H_(2)S gt H_(2)Se gt H_(2)Te = H_(2)Po`


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