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A gas turns lime water milky and acidified K2Cr2O7 solution green then gas is :

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A gas turns lime water milky and acidified K2Cr2O7 solution green then gas is :

(A) HCl 

(B) H2S

(C) SO2 

(D) CO2

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Correct Answer is: (C) SO2 

 SO2 + Ca(OH)2 → CaSO3(milky)

 K2Cr2O7 + SO2 + H+ → 2Cr3+(green) + K2SO4 + H2O

 

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