A test tube contains 4 mL of a solution that is 0.1 M in one or more of the following salts: AgNO3, — Descriptive Chemistry Chemistry Question
Question
A test tube contains 4 mL of a solution that is 0.1 M in one or more of the following salts: AgNO3, Mn(NO3)2, and Al(NO3)3. 1 mL of 6 M HCl is added to the test tube, which causes neither a color change nor formation of a precipitate. After subsequent addition of 1.5 mL aqueous NaOH and 0.5 mL of 3% aqueous H2O2 and brief heating in a hot water bath, there is a dark precipitate in the test tube. What may be determined about the cations initially present?
A.
Must be present: Ag+ | May be present: Al3+ | Must be absent: Mn2+
B.
Must be present: Al3+ | May be present: Mn2+ | Must be absent: Ag+
C.
Must be present: Al3+ | May be present: Ag+ | Must be absent: Mn2+
D.✓ Correct
Must be present: Mn2+ | May be present: Al3+ | Must be absent: Ag+
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