The correct set that contains all kinds (basic,acidic,amphoteric,and neutral) of oxides is:

  • A
    $Na_2O, K_2O, Al_2O_3$ and $As_2O_3$
  • B
    $Al_2O_3, As_2O_3, CO$ and $NO$
  • C
    $K_2O, Cl_2O_7, As_2O_3$ and $NO$
  • D
    $Na_2O, N_2O, Al_2O_3$ and $CO$

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Considering the elements $B$,$Al$,$Mg$,and $K$,the correct order of their metallic character is:
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$(b)$ $Al > Mg > B > K$
$(c)$ $Mg > Al > K > B$
$(d)$ $K > Mg > Al > B$

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