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Questions and Answers
What color precipitate forms when thiocyanate (SCN-) reacts with SnCl2 and Co(NO3)2?
What color precipitate forms when thiocyanate (SCN-) reacts with SnCl2 and Co(NO3)2?
- Blood red
- Orange
- White
- Prussian blue (correct)
Which compound liberates toxic gas HCN when reacting with SnCl2?
Which compound liberates toxic gas HCN when reacting with SnCl2?
- Thiocyanate (SCN-) (correct)
- [Fe(CN)6]3-
- [Fe(CN)6]4-
- Phosphate (PO3-4)
What color does the wet reaction of S.S with Magnesia mix produce in the presence of phosphate (PO3-4)?
What color does the wet reaction of S.S with Magnesia mix produce in the presence of phosphate (PO3-4)?
- White crystalline ppt
- Chocolate brown ppt (correct)
- Yellow ppt
- -ve
What color does the wet reaction of S.S with AgNO3 solution produce in the presence of arsenate (AsO43-)?
What color does the wet reaction of S.S with AgNO3 solution produce in the presence of arsenate (AsO43-)?
What color does the dry test of NO2 - powder with dil. HCl produce?
What color does the dry test of NO2 - powder with dil. HCl produce?
Flashcards
SCN- + SnCl2 + Co(NO3)2 color?
SCN- + SnCl2 + Co(NO3)2 color?
Prussian blue precipitate.
HCN gas source with SnCl2?
HCN gas source with SnCl2?
Thiocyanate (SCN-).
S.S + Magnesia mix + PO43- color?
S.S + Magnesia mix + PO43- color?
Chocolate brown precipitate.
S.S + AgNO3 + AsO43- color (cold)?
S.S + AgNO3 + AsO43- color (cold)?
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NO2- powder + dil. HCl color?
NO2- powder + dil. HCl color?
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Study Notes
Chemical Reactions and Precipitates
- Thiocyanate (SCN-) reacts with SnCl2 and Co(NO3)2 to form a red precipitate.
- Thiocyanate (SCN-) liberates toxic gas HCN when reacting with SnCl2.
- The wet reaction of Sulfide (S.S) with Magnesia mix in the presence of phosphate (PO3-4) produces a white color.
- The wet reaction of Sulfide (S.S) with AgNO3 solution in the presence of arsenate (AsO43-) produces a yellow color.
- The dry test of NO2 - powder with dil. HCl produces a brown color.
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