A crystalline solid X reacts with dilute HCl to liberate a gas Y. The gas Y decolourises acidified `KMnO_(4)`. When a gas Z is s

A crystalline solid X reacts with dilute HCl to liberate a gas Y. The gas Y decolourises acidified `KMnO_(4)`. When a gas Z is slowly passed into aqueous solution of Y, colloidal sulphur is obtained. X and Z could be respectively.
A. `Na_(2)S,SO_(3)`
B. `Na_(2)SO_(4),H_(2)S`
C. `Na_(2)SO_(3),H_(2)S`
D. `Na_(2)SO_(4),SO_(2)`

A crystalline solid X reacts with dilute HCl to liberate a gas Y. The gas Y decolourises acidified `KMnO_(4)`. When a gas Z is slowly passed into aque

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