Page 72 - Chemistry - XI

1. NaOH test:

ZnCl +2NaOH Zn OH +2NaCl
2 2
Whitte ppt.

Zn OH +2NaOH Na ZnO+ 2H O
2 2 2 2
Soluble

2. KFeCN test:

4
6

2ZnCl+ KFeCN Zn FeCN + 4KCl
2 4 6 2 6
Bluish white ppt.
Test for Mn +2
Mn +H S MnS +2H +

2
2
Buff or flesh

coloured ppt.

MnS+ 2HCl → MnCl +H S
2 2
Bromine water test:

MnCl +2NaOH Mn OH +2NaCl
2 2
Whiite ppt.

Mn OH +O MnOOH
2 2
(From (Brown

bromine water) ppt.)

DMG test:
OH O

NiCl +2NH OH+2CH C=N OH CH C= N N =C CH +2NH Cl+2HO
2 4 3 3 3 4 2
N Ni
CH C=N OH CH C= N N =C CH

3 3 3

O OH
S carlet red ppt.

Test for CO +2
Co +H S CoS +2H +
+2
2
Black ppt.

CoS+6HCl+2HNO → 3CoCl+ 2NO+3S+4HO
3 2 2

Aqua regia
1. KNO test:
2 2

KCoNO + 2KCl+2CH COOK +NO+ HO
CoCl +7KNO +2CH COOH CoCl +7+7+7
2 2 2 2 2 2 3 3 2 6 3 2
Yeellow ppt.

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