The group of four basic radicals, CO^(2+) Nl^(2+) Mn^(2+) and Żn^(2+) have group reagent hydrogen sulphide in presence of NH.OH. These radicals are precipitated as sulphides which are insoluble in NH_(4)OH. Addition of HS increases the ionization of NH_4OH due to reaction of OH and H lon. NH_4OHharrNH_(4) + OHH_2S hArr2H+S^(2-) Salt (A) of above group cations having black colour treated with above reagent and produced compound (B), (B) on treatment with HCl and KCIO, again converted into (A) with the evolution of HS gas. (A) again treated with KCN gives a buff coloured ppt. (C) which dissolved in excess KCN and produced (D)QIn above paragraph, given compound 'D' is

The group of four basic radicals, CO^(2+) Nl^(2+) Mn^(2+) and Żn^(2+)

1.	The group of four basic radicals, CO^(2+) Nl^(2+) Mn^(2+) and Żn^(2+) have group reagent hydrogen sulphide in presence of NH.OH. These radicals are precipitated as sulphides which are insoluble in NH_(4)OH. Addition of HS increases the ionization of NH_4OH due to reaction of OH and H lon. NH_4OHharrNH_(4) + OHH_2S hArr2H+S^(2-) Salt (A) of above group cations having black colour treated with above reagent and produced compound (B), (B) on treatment with HCl and KCIO, again converted into (A) with the evolution of HS gas. (A) again treated with KCN gives a buff coloured ppt. (C) which dissolved in excess KCN and produced (D)QIn above paragraph, given compound 'D' is
Answer» `K_4[FE(CN)_6]` `K_4[Mn(CN)_6)` `K_4[CO(CN)_6]` `K_4[Ni(CN)_6]` ANSWER :C