A) \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}\](Order of acidic strength)
B) \[S>Se>Te>O\](Order of electron affinity)
C) \[Si<S<P<Cl\](Order of IE)
D) \[{{S}^{-2}}>C{{l}^{-}}>{{K}^{+}}>C{{a}^{+2}}\] (Order of radius)
Correct Answer: A
Solution :
[a] Correct order of acidic strength is \[N{{H}_{3}}<P{{H}_{3}}<As{{H}_{3}}<Sb{{H}_{3}}\]
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