r u preparin for AIEEE??see dis... :)

Blazing goIITian

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26 Apr 2007 19:01:18 IST

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26 Apr 2007 19:01:18 IST

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2482

r u preparin for AIEEE??see dis... :)

Engineering Entrance , JEE Main , JEE Advanced , Chemistry , , academic

TESTS FOR SO2:

1) acidic K2Cr2O7 turns green

2) color of acidic KMnO4 is discharged

3) Color of I2 soln is discharged

4) Acidic KIO3 or starch paper turns blue

5) Passed in lime water => white turbidity of CaSO3=> excess gas passed => clear soln of Ca(HSO3)2.

TESTS FOR H2S:

1) color of acidic K2Cr2O7 turns green

2) color of acidic KMnO4 is discharged

3) Lead acetate paper turns black

4) Cadmium acetate turns yellow

BROWN RING TEST:

Nitrite+ dil H2SO4 or dil CH3COOH + fresh FeSO4 => brown ring

2NaNO2 + H2SO4 => 2 HNO2 + Na2SO4

3HNO2 => 2NO + HNO3 + H2O

FeSO4 + NO => Fe(NO)SO4

FeSO4 + 5H2O + NO => [Fe(H2O)5NO]SO4

Co+2 salt properties: [Group 4]

Color: pink

It forms a pink soln

Its sulphide is black

It gives yellow ppt with acetic acid and KNO2.

Ni+2 salt properties: [Group 4]

Color: green salt

It forms a green soln

Its sulphide is black

It gives red ppt with dimethyl glycerine in ammonical medium

FLAME TEST:

The chloride salts of Ba+2 and Ca+2 ions are more volatile and flame test is applicable only for volatile salts.The salt is treated with a few drops of conc HCl and a paste is prepared. This is done to convert the metal ions into volatile chlorides. A little of this paste is applied at the tip of platinum wire nd is heated in an oxidizing flame. Barium ions give an apple green flame to it and calcium ions give them brick red flame.

Comments (4)

SINDHURA KADIYALA

Blazing goIITian

Joined: 23 Apr 2007 18:54:45 IST

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27 Apr 2007 21:17:11 IST

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thanx a lot....

ruhi agrawal

Blazing goIITian

Joined: 26 Oct 2006 17:16:30 IST

Posts: 530

27 Apr 2007 21:54:49 IST

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thanxxxxxxxxxxxxxxxxxxxxxxxxxx dear

Akshat Agarwal

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Joined: 8 Mar 2011 21:38:28 IST

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18 Sep 2011 08:19:42 IST

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Whoa ty

aryan

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Joined: 16 Mar 2012 07:57:09 IST

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16 Mar 2012 07:57:16 IST

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thankssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss a lot

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