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Reviewed CSCA Chemistry question · Standard

下列物质中,既能与稀盐酸反应放出气体,又能与氢氧化钠溶液反应放出气体的是?

  1. Al
  2. NaHCO3
  3. NH4Cl
  4. Al2O3
Show the answer and explanation

Correct answer

A. Al

Principle or equation

铝既能与酸反应生成氢气,又能与强碱溶液反应生成氢气。

Why this answer is correct

铝与稀盐酸反应:2Al+6HCl=2AlCl3+3H2↑;铝与氢氧化钠溶液反应:2Al+2NaOH+2H2O=2NaAlO2+3H2↑。NaHCO3与酸放CO2,但与碱不放出气体;NH4Cl与碱放NH3,但与酸不反应;Al2O3两性氧化物,与酸碱反应均无气体。

Example

铝是典型的两性金属,既能与酸又能与强碱反应放出氢气。

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