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_X__B. ___Na2CO3 ----> __Na2O_ + ___ CO2
__X_C. ___CaO + ___ SiO2 ----> __CaSiO3_
_X__D. ___CaCO3 ----> ___CaO + _CO2__
___E. _4__HF + ___SiO2 ----> ___ SiF4 + __2 H2O_
_X__F. ___ Na2O + ___SiO2 ----> ___Na2SiO3_