(i)When silver nitrate solution is added to a salt solution of (A), a black precipitate is - obtained. (A) decolourizes acidified permanganate solution. Identify the acid radical in (A)
(ii) On heating the salt, decripitation takes place. On heating a mixture of salt, manganese dioxide and conc. `H_2SO_4`, a greenish yellow gas is evolved. The gas evolved turned moist blue litmus red and then turned it colourless. On performing the flame test, the salt imparted a crimson red colour to the flame. Identify the cation and anion in the salt.

Explanation

(i) The acid radical must be sulphide .
`S^(2-)+2AgNO_3toAg_2S+2NO_(3)^(-)`
`5S^(2-)+2MnO_4^(-)+16Hto5S+2Mn^(2+)+8H_2O`
(ii)The greenish yellow gas envoled is chlorine.
`2Cl^(-)+MnO_2+2H_2SO_4toMnSO_4+2H_2O+Cl_2+SO_4^(2-)`
`Cl_2+H_2Oto 2HCl+(O)`
Vegetable dyw(o)`to`Colorless oxidation product `:.` the acid radical in the salt is choride Since crimson red color is imparted the basic radical is strotium.