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Question

The unknown compounds P,Q,R and S in above reaction sequence are respectively :
1175048_4ec5093ddc9b4f1587e148f7bcb42854.png

A
K2SO3, BaSO3, BaS , H2S
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B
K2S, BaS, CS2,H2S
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C
K2SO4,BaSO4, BaS, H2S
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D
K2SO4,BaSO4,BaCO3, CO2
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