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(i) An aqueous solution of a compound A ...

(i) An aqueous solution of a compound A is acidic towards litmus and A sublimes at about `300^(@)C`
(ii) A solution of A, on treatment with an excess of `NH_(4)SCN`, gives a red compound, and on treatment with a solution of `K_(4)[Fe(CN)_(6)]`, gives a blue compound.
(iii) The solid A, on being heated with an excess of `K_(2)Cr_(2)O_(7)` in the presence of concentrated `H_(2)SO_(4)`, evolves deep red vapours of D.
(iv) On passing the vapours of D into a solution of NaOH and then adding the solution of acetic acid and lead acetate, a yellow precipitate of a compound E is obtained.
Q. Which is the oxidation state of the central atom in vapour D?

Text Solution

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(i) `PeCl_(3) overset("hydrolysis")underset("by" H_(2)O) to underset("acetic")underset("acidic")(Fe(OH)_(3) + 3HCl)`
(ii) `4FeCl_(3) + 3NH_(4)SCN to Fe(SCN)_(3) + 3NH_(4)Cl`
Ferric thiocyanate (B)
(red colour)
`4FeCl_(3) + underset("Ferrioferro cyanide blue colour C")(3K_(4)[Fe(CN_(4))] to Fe_(4)[Fe(C CN)_(6)] + 12 kCL`
(iii) `2FeCl_(3) + K_(2)Cr_(2)O_(7) + 3H_(2)SO_(4) to underset("Chromyl chloride (red) (D)")(Fe_(2)(SO_(4))_(3) + 2KCl + 2CrO_(2)Cl_(2) uarr + 3H_(2)O`
(iv) `Cr_(2)O_(2)Cl_(2) + 2NaOH to Na_(2)CrO_(4) + 2HCl`
`underset("Lead chromate")(Na_(2)CrO_(4)) + (CH_(3)COO)_(2)Pb to PbCrCO_(4)darr + 2CH_(3)COONa`
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