下列实际应用中，利用中和反应原理的是
A．用稀硫酸除铁锈
B．用熟石灰改良酸性土壤
C．实验室用石灰石和稀盐酸制取CO2
D．用生石灰作食品干燥剂
答案：B
分析：根据中和反应的定义进行分析，稀硫酸除铁锈为酸与金属氧化物的反应，熟石灰改良酸性土壤利用的是酸碱中和的原理，石灰石与盐酸的反应为酸与盐的反应，不是中和反应，生石灰与水的反应为金属氧化物与水的反应．
解：A、稀硫酸除铁锈为酸与金属氧化物的反应，不是中和反应，故A错误；
B、熟石灰改良酸性土壤利用的是酸碱中和的原理，故B正确；
C、石灰石与盐酸的反应为酸与盐的反应，不是中和反应，故C错误；
D、生石灰与水的反应为金属氧化物与水的反应，故D错误；
故选B．
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