A white crystalline salt A reacts with dilute $HCl$ to liberate a suffocating gas B and also forms a yellow precipitate. The gas B turns potassium dichromate acidified with dilute $H_2SO_4$ into a green-colored solution C. A, B, and C are respectively ............

Question

$Na_2S_2O_3$, $SO_2$, $Cr_2(SO_4)_3$

$Na_2SO_3$, $SO_2$, $Cr_2(SO_4)_3$

$Na_2SO_4$, $SO_2$, $Cr_2(SO_4)_3$

$Na_2S_2O_3$, $SO_2$, $Cr_2(SO_4)_3$

Solution

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