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A certain compound when burned gives three oxides. The first turned lime water milky, the second turned anhydrous `CuSO_4` blue and the third formed an aqueous solution of low pH. The elements present in the compound are
A. C, O and S
B. C, H and Ca
C. C, H and Na
D. C, H and S

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Correct Answer - D
Compound contains C, H and S and on burning gives `CO_2, H_2O and SO_2`.
`CO_2` turns lime water milky
`H_2O` turns anhydrous `CuSO_4` blue.
`SO_2` forms an acidic solution of low pH.

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