A crystalline solid 'X' reacts with dil. HCl to liberate a gas 'Y' . ' – InterviewSolution

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1.	A crystalline solid 'X' reacts with dil. HCl to liberate a gas 'Y' . 'Y' decolourises acidified KMnO_4. When a gas'Z' is slowly passed into an aqueous solution of 'Y' , colloidal sulphur is obtained . 'x' and 'Z' could be , respectively.
Answer» `Na_2S, SO_3` `Na_(2)SO_4 , H_2S` `Na_2SO_3 , H_2S` `Na_2SO_4 , SO_4` ANSWER :C

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