An inorganic compound $(A)$ made of the two most abundant elements in the Earth's crust is used in building construction. When $(A)$ reacts with carbon,it forms a poisonous gas $(B)$,which is a very stable diatomic molecule. Identify compounds $(A)$ and $(B)$.

  • A
    $SiO_2, CO_2$
  • B
    $SiO_2, CO$
  • C
    $SiO_2, N_2$
  • D
    $CaO, CO_2$

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