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Gaokao Chemistry Practice Question

下列方程式不能准确解释相应实验现象的是

  1. A.酚酞滴入醋酸钠溶液中变为浅红色: $\mathrm{CH}_{3} \mathrm{COO}^{-}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{CH}_{3} \mathrm{COOH}+\mathrm{OH}^{-}$
  2. B.金属钠在空气中加热生成淡黄色固体: $4 \mathrm{Na}+\mathrm{O}_{2}=2 \mathrm{Na}_{2} \mathrm{O}$
  3. C.铝溶于氢氧化钠溶液, 有无色气体产生: $2 \mathrm{Al}+2 \mathrm{OH}^{-}+2 \mathrm{H}_{2} \mathrm{O}=2 \mathrm{AlO}_{2}^{-}+3 \mathrm{H}_{2} \uparrow$
  4. D.将二氧化硫通入氢硫酸中产生黄色沉淀: $\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{~S}=3 \mathrm{~S} \downarrow+2 \mathrm{H}_{2} \mathrm{O}$

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