Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate paper black.

Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate paper black. In the first reaction X is oxidised and Y is reduced. Y on further oxidation with `O_(3)` gives a compound W
In which of the following reactions also the above turbidity (Z) is seen
A. `K_(2)Cr_(2)O_(7)+Na_(2)SO_(3) overset"acidic medium"rarr`
B. `Na_(2)S_(2)O_(3)+Cl_(2)+H_(2)Orarr`
C. `SCl_(4)+H_(2)Orarr`
D. `SO_(2)+H_(2)O_(2)rarr`

Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate paper black. In the first reaction

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