A) \[N{{H}_{3}}<P{{H}_{3}}<As{{H}_{3}}\]-acidic nature
B) \[L{{i}^{+}}<N{{a}^{+}}<{{K}^{+}}<C{{s}^{+}}\]-ionic radius
C) \[A{{l}_{2}}{{O}_{3}}<MgO<N{{a}_{2}}O<{{K}_{2}}O\]-basic
D) \[Li<Be<B<C\]-1st ionisation potential
Correct Answer: D
Solution :
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