Which of the follow ing on the addition will cause deep red colour to disappeared ? underset("pale yellow")(Fe_(aq)^(3+)) + underset("colourless")(SCN_(aq)^(-)) hArr underset("deep red")([ Fe (SCN) ]_(aq)^(2+))

Which of the follow ing on the addition will cause deep red colour to

1.	Which of the follow ing on the addition will cause deep red colour to disappeared ? underset("pale yellow")(Fe_(aq)^(3+)) + underset("colourless")(SCN_(aq)^(-)) hArr underset("deep red")([ Fe (SCN) ]_(aq)^(2+))
Answer» `AgNO_(3)` `HgCl_(2)` `H_(2)C_(2)O_(4)` `H_(2)O` Solution :a) `Ag^(+)` ion removes `SCN^(-)` `Ag^(+)` ion removes `SCN^(-) to AGCNS DARR` b) `Hg^(2+)` ion remove `SCN^(-)` `Hg^(2+) 2SCN^(-) to Hg(CNS)_(2) darr` c) `C_(2)O_(4)^(2-)` ion remove `Fe^(3+)` by complex formation `Fe^(3+)+3 C_(2)O_(4)^(2-) to [Fe(C_(2)O_(4))_(3)]^(3-)` complex SOLUBLE