The major components of cement are
- A$SiO_2, Al_2O_3$
- B$Al_2O_3, Fe_2O_3$
- C$SiO_2, Fe_2O_3$
- D$SiO_2, CaO$
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Which of the following are carbonate ores?
$I$. Magnetite
$II$. Kaolinite
$III$. Siderite
$IV$. Calamine
$I$. Magnetite
$II$. Kaolinite
$III$. Siderite
$IV$. Calamine
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