Question

a. (A) (yellow coloured solution ) changes to light green coloured solution (B) on passing `H_(2)S` gas (A) and (B) both give white ppt. with `BaCI_(2)` solution, insoluble in conc. `HCI`(A) given blue coloured ppt (C ) with `K_(4)[F2(CN)_(6)]` B does not .What are (A),(B) and (C )?
b. Identify A,B,C and D in the following reactions Bauxite + chemical `+ CI_(2) overset(Delta) to A + CO`
`A + H_(2)O rarr B + HCI, B + H_(2)SO_(4) rarr C + H_(2)O `
`B + NaOH rarr D + H_(2)O`

Answer 1

(A) `FeCI_(3)` (B) `FeCI_(2)`
(C ) `KFe^(III)[Fe^(II)(CN)_(6)]` prussian blue
b. `underset("Bauxite")(AI_(2)O_(3)) + 3C +3CI_(2) overset(Delta ) to underset((A))(2AICI_(3)) + 3CO`
`underset((A))(AICI_(3)) + 3H_(2)O rarr underset((B))(AI(OH)_(3)) + 3HCI`
`underset((B))(2AI(OH)_(3)) + 3H_(2)SO_(4) rarr underset((C))(AI_(2)(SO_(4))_(3)) + 6H_(2)O`
`underset((B))(AI(OH)_(3)) + NaOH rarr underset((D))(NaAIO_(2)) + 2H_(2)O`