Sodium nitroprusside test is for detection of sulphur from soda extract, it produces violet colour when sulphur is present.
Na2S + Na2[Fe(CN)5NO] ........>Na4[Fe(CN)5NOS]
Sodium nitroprusside Sodium sulpho nitroprusside ( violet colour)
Silver nitrate test is for detection of halogen
NaX + AgNO3 ........>AgX + NaNO3
White ppt soluble in NH4OH is AgCl; Pale yellow ppt sparingly soluble in NH4OH is AgBr; Bright yeoolow ppt insoluble in NH4OH is AgI; thus the halogen present in the compound can be confirmed accordingly.
with sodium nitroprusside and few drops of alkali
Aldehydes give a deep red colour (execpt formaldehyde)
whereas in Ketones red colour changes to orange.
Thanks a lot all three of you...But Madhu and Abhishek have given contradicting answers....does Nitrogen give violet with Sodium Nitroprusside or Sulphur ?? ...... Also, Benzophenone does not give the sodium nitroprusside test .... Found a good link for the AgNO3 test : Check it out: http://www.chemguide.co.uk/organicprops/haloalkanes/agno3.html . . . . . . . Though it does not mention terminal alkynes giving the test ...?? Can any1 please confirm the effect of acidic terminal alkynes on AgNO3 ??
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