题目:
下列解释事实的化学方程式或离子方程式不正确的是( )
A.用食醋除去暖水瓶中的水垢:2CH3COOH+CaCO3═Ca2++2CH3COO-+CO2↑+H2O
B.自然界各种原生铜的硫化物经氧化、淋滤作用后产生的硫酸铜,遇到难溶的PbS,慢慢转变为铜蓝(CuS):Cu2++SO42-+PbS═CuS+PbSO4
C.在盐碱地(含较多NaCl、Na2CO3)上通过施加适量CaSO4,可降低土壤的碱性:CaSO4+Na2CO3═CaCO3↓+Na2SO4
D.在燃煤时加入适量石灰石,可减少SO2的排放:2CaCO3+O2+2SO2═2CaSO3+2CO2
答案:
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