A) \[Fe\]
B) \[Al\]
C) \[Na\]
D) All of these
Correct Answer: A
Solution :
(i) Brown glass contains \[\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}\]and sodium and calcium silicate. (ii) Cement has about 1% \[\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}\text{.}\] \[\therefore \]Cement and brown glass both have iron.
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