Magnesium ribbon was added to each of the following aqueous solution in turn: H2SO4, AgNO3, HNO3, HCl, NH3, HCl, NH3. In which case does the magnesium become covered with a dark precipitate?

  • A H2SO4
  • B AgNO3
  • C HNO3
  • D NH3
  • E HCl

The correct answer is B. AgNO3

No explanation given
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