Page 62 - Chemistry - XI

7. Test for Br –

(a) AgNO test:
3
Br +AgNO AgBr+NO 3

3
P ale yellow ppt.

(b) Chlorine water test:
2Br+Cl 2Cl+ Br

2 2
Br +CS Yellow or orange coloured solutionn
2 2
(c) MnO test:
2

2Br+ MnO+3H SO 2HSO +MnSO+ 2H O+ Br

2 2 4 4 4 2 2
Browwn

8. Test for I –
(a) AgNO test:
3

I+ AgNO AgI+NO
3 3
Yellow ppt.

(b) Chlorine water test:

2I +Cl 2Cl +I
2 2
I+CS Violet coloured solution
2 2
(c) MnO test:
2

2I +MnO +3HSO 2HSO+ MnSO +2HO +I
2 2 4 4 4 2 2
Violet

9. Test for CH COO -
3
(a) Oxalic acid test:

2CHCOO +COOH COO +2CH COOH
3 3
| | Vinegar like smell

COOH COO
(b) FeCl test:

3

FeCl +3CH COO CHCOO Fe +3Cl

3 3 3 3
Wine red

(c) Ester test:

2CHCOO +H SO 2CHCOOH +SO 2
3 2 4 3 4
CH COOH +C HOH
CH COOC H+ HO
Conc.H SO 4
2
3 2 5 3 2 5 2
Fruity smell
10. Test for CO 2−
2
4
(a)
(a) CaCl test: CaCl 2
2
CO +CaCl CaC O +2Cl
CO
2 4 2 2 4
White ppt..

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