passwella.
Menu

JAMB Chemistry 1982 Question 11

Question 11

Metals and their Compounds

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

  1. A.H2SO4
  2. B.AgNO3
  3. C.HNO3
  4. D.NH3
  5. E.HCl.
Show the answer and explanation

Answer: B (AgNO3)

Explanation

Magnesium is above silver in the activity series, so it displaces silver, which coats the ribbon as a dark deposit. The acids just give a gas.