IAS Chemistry Papers (Read 6 times)

1. A certain inorganic compd A on heating loses its water of crystallization. On further heating a blackish powder B and 2 oxides of S - C and D are obtained, the powder B on boiling with HCl gives a yellow soln E. When H2S is passed thro E a white turbidity F and apple green soln G are obtained. The soln E on treatment with thiocyanate ions gives a blood red color compd H.Identify A to H.

2. A green colored metallic chloride A when treated with sod hydroxide and H2O2 gives a yellow soln due to the formation of compd B. The color of this soln changes to orange when dil H2SO4 is added to it. It is due to the formation of compd C. When KCl is heated along with C in presence of conc H2SO4 a red volatile liq D is formed. The compd C when treated with amm chloride forms compd E which decomposes on heating giving a colorless gas F water and green residue G. When Mg is burnt in the presence of F a white solid H is formed. The latter on hydrolysis forms a gas I which gives white fumes with HCl. Identify A to I giving involved eqns