1
Q
[Cu(H2O)6]2+
A
Pale blue
2
Q
Cu(OH)2
A
Pale blue precipitate
NH3 dropwise
3
Q
[Cu(NH3)4(H2O)2]2+
A
Dark blue
Excess NH3
4
Q
CuCl4-
A
Yellow
Excess HCl
5
Q
Cu+
A
White precipitate
Add I2
6
Q
CoCl42-
A
Blue
Excess HCl
7
Q
[Cr(H2O)6]3+
A
Pale purple
(Heat = green)
8
Q
Cr(OH)3
A
Dark green precipitate
NH3 dropwise
9
Q
[Cr(NH)3]3+
A
Purple
Excess NH3
10
Q
[Cr(OH)6]3-
A
Dark green
Excess OH-
11
Q
Cr2O7
A
Orange
12
Q
CrO42-
A
Yellow
Hot H2O2
13
Q
[Mn(H2O)6]2+
A
Pale pink
14
Q
Mn(OH)2
A
Pale brown precipitate
15
Q
[Fe(H2O)6]2+
A
Pale green
16
Q
Fe(OH)2
A
Dark green precipitate
17
Q
[Fe(H2O)6]3+
A
Yellow
18
Q
Fe(OH)3
A
Orange-brown precipitate
19
Q
MnO4-/Fe2+ —> Mn2+/ Fe3+
A
Purple —> pale pink
20
Q
I-/Fe3+ —> I2/ Fe2+
A
Orange brown —> brown
Chemistry OCR A
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