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JAMB - Chemistry (1982 - No. 37)

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?
H2SO4
AgNO3
HNO3
NH3
HCl

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