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14. In extraction of iron, calcium oxide is used to remove..
a. Iron impurities
b. Dull nature of the iron
c. Silicon impurities
d. Silica impurities

10. Cement is obtained by heating a mixture of Limestone and Clay containing....
a. Si2O and CO
b. CaO and SiO2
c. SiO2 only
d. SiO2 and Aluminium Oxide