Bauxite ore is generally contaminated with impurity of oxides of two elements `X` and `Y`. Which of the following statement is correct ?

Options

A. `X` is a non-metal and belongs to the third period while `Y` is a metal and belongs to the fourth period.
B. One of two oxides has three-dimesnsional polymeric structure.
C. both (a) and (b) are correct.
D. None of the above

Answer

C

Explanation

Two oxides present in bauxite as an impurity are `SiO_(2)` and `Fe_(2)O_(3)`. `Si` belongs on the third period and `Fe` to the fourth period. `SiO_(2)` has a three dimensional structure.