Question on: JAMB Chemistry - 2024
Aqueous solution of sodium hydroxide can be used to test for the presence of: I. Ca2+, II. Zn2+, III. Cu2+
A
I only
B
I and III
C
I, II and III
D
I and II only
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Correct Option: C
Here's how aqueous NaOH can test for these ions:
- Ca2+: Forms a white precipitate of Ca(OH)2.
- Zn2+: Forms a white precipitate of Zn(OH)2, which dissolves in excess NaOH to form [Zn(OH)4]2-.
- Cu2+: Forms a blue precipitate of Cu(OH)2.
Therefore, NaOH can test for all three ions.
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