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
Correct Answer: Option B
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