1.

The incorrect order is:

Answer»

`N gt P gt As`: strength of `pi`-bond with oxygen atom
`SiF_(4) gt SiCl_(4) gt SiBr_(4) gt SiI_(4)`: Thermal stability
`H_(2)S gt H_(2)Se gt H_(2)TE`: Arrhenious acid character
`CaBr_(2) gt MgBr_(2) gt BeBr_(2)` Melting point

Solution :Correct ORDER of Arrhenious acid character
`H_(2)S LT H_(2)Se lt H_(2) Te`
the vlaue of `K_(a)` is maximum for `H_(2)Te`, due to least bond enegy among givenn hydrides.


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