A mixture of twosalt was treated as follows : i. The mixturewas heatedwith magnanese dioxide andconcentratedsulphuric acid , when a yellowish -greengaswas liberated. ii. The mixture onheatingwithsodiumhydroxidesolutiongave a gaswhich turnedred litmusblue iii. Itssolution in watergave a blue precipitatewith potassiumferricyanide andredcolourtionwith ammoniumthiocynate iv. The mixture was boiled with potassium hydroxide and the libratedgas was bubbledthrough an alklinesolutionof K_(2)HgI_(4)to give a brownprecipitateidentifythe two salts givesionic equationfor thereactioninvolvedin the tests (i) , (ii) and (iii).

A mixture of twosalt was treated as follows : i. The mixturewas heate

1.	A mixture of twosalt was treated as follows : i. The mixturewas heatedwith magnanese dioxide andconcentratedsulphuric acid , when a yellowish -greengaswas liberated. ii. The mixture onheatingwithsodiumhydroxidesolutiongave a gaswhich turnedred litmusblue iii. Itssolution in watergave a blue precipitatewith potassiumferricyanide andredcolourtionwith ammoniumthiocynate iv. The mixture was boiled with potassium hydroxide and the libratedgas was bubbledthrough an alklinesolutionof K_(2)HgI_(4)to give a brownprecipitateidentifythe two salts givesionic equationfor thereactioninvolvedin the tests (i) , (ii) and (iii).
Answer» Solution :The maxiturecontain `Fe^(2+) ,NH_(4)^(oplus) + CI^(Theta)` ions (with an impurity of `Fe^(3+)` ions) `rarr "Test of" NH_(3)` is confirmed. `rarr "Mixture must be containing" NH_(4)Cl` `Cl^(Theta) + MnO_(2) + H_(2)SO_(4) to underset("Greenish yellow")(Cl_(2)) uarr GAS + MnSO_(4)` Mixture + `NaOH to NH_(4)OH underset(NaOH)(to) NH_(3) uarr overset(Red)underset("Litmus")(to)` blue `underset(KOH)(Boil) gas overset(K_(2)H_(2)I_(4))(to)` brown `NH_(3)` confirmed `NH_(4)Cl` is confirmed. Now `Fe^(2+) + K_(4)[(FeCN)_(6)] to underset("Ferro-ferri cyanide")(Fe[Fe(CN)_(6)]_(2)`) blue `rarr` Mixture contains `FeCl_(2)` Last is interseting as it signifies presence of `Fe^(3+) (Fe^(3+) + NH_(4)CNS to Fe(SCN)_(3)]` Either `Fe^(2+) overset("Oxidised")(to) Fe^(3+)` or may be mixture contains `FeCl_(3)`