Passage - VII : An aqueoussolution of a gas (x) gives the following reactions (1) It decolourises an acidified K_(2)Cr_(2)O_(7) solution (2) On boiling with H_(2)O_(2) cooling it and then adding on aqueous solution of BaCl_(2), a precipitation insoluble in dilute HCl is obtained (3) On passing H_(2)S in the solution white turbidity (y) is obtained (4) When gas 'x' is heated with concentratedHNO_(3) evolves a brown coloured gas (A) (5) When 'x' also dissolves in Na_(2)SO_(3) solution on heating a clear solution (C ) is formed. "C" is

Passage - VII : An aqueoussolution of a gas (x) gives the following r

1.	Passage - VII : An aqueoussolution of a gas (x) gives the following reactions (1) It decolourises an acidified K_(2)Cr_(2)O_(7) solution (2) On boiling with H_(2)O_(2) cooling it and then adding on aqueous solution of BaCl_(2), a precipitation insoluble in dilute HCl is obtained (3) On passing H_(2)S in the solution white turbidity (y) is obtained (4) When gas 'x' is heated with concentratedHNO_(3) evolves a brown coloured gas (A) (5) When 'x' also dissolves in Na_(2)SO_(3) solution on heating a clear solution (C ) is formed. "C" is
Answer» `Na_(2)SO_(3)` `Na_(2)S_(2)O_(3)` `Na_(2)SO_(4)` `Na_(2)S_(4)O_(6)` Solution :Thermally more STABLE salts are `Al_(2)(SO_(4))_(3), CuSO_(4), FeSO_(4)`