(I) (Na_(2)S+I_(3)^(-))+ Na_(2)SO_(3) underset("Boil")rarr Compound [A] +2NaI (II){:(A(aq)+AgNO_(3)rarr,"White ppt"[B]("unstable")),(,""darr"Turning dark on standing"),(,"Black compound"[C]):} (III) {:(A(aq)+FeCI_(3)rarr,"Dark-violet colouration"[E]),(,""darr),(,[F]"colour disappears on standing"):} Compound 'A' is:

(I) (Na_(2)S+I_(3)^(-))+ Na_(2)SO_(3) underset("Boil")rarr Compound [A

1.	(I) (Na_(2)S+I_(3)^(-))+ Na_(2)SO_(3) underset("Boil")rarr Compound [A] +2NaI (II){:(A(aq)+AgNO_(3)rarr,"White ppt"[B]("unstable")),(,""darr"Turning dark on standing"),(,"Black compound"[C]):} (III) {:(A(aq)+FeCI_(3)rarr,"Dark-violet colouration"[E]),(,""darr),(,[F]"colour disappears on standing"):} Compound 'A' is:
Answer» `Na_(2)SO_(4)` `Na_(2)S_(2)O_(3)` `Na_(2)S_(4)O_(6)` `Na_(2)SO_(3)` Answer :B