Which of the following on addition will cause deep red colour to disappear ? `(A) underset("Pale yellow")(Fe^(3+)(aq)) + underset("Colourless")(SCN^(-
Which of the following on addition will cause deep red colour to disappear ?
`(A) underset("Pale yellow")(Fe^(3+)(aq)) + underset("Colourless")(SCN^(-)(aq))hArr underset("Deep red")([Fe(CNS)^(2)](aq))`
`I. AgNO_(3)" "II.HgCl_(2)" "III.H_(2)C_(2)O_(4)" "`(oxalic acid)
A. I,II
B. II,III
C. I,III
D. I,II,III
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Correct Answer - D
`Ag^(+)+SCN^(-)rarr AgSCNdarr`
`Hg^(2+)+SCN^(-) rarr Hg(SCN)_(2)darr`
`4Fe^(3+)+3(COO)_(2)^(2-)rarr2Fe_(2)(COO)_(3)darr`
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