15) A gas when passed through the K2Cr2O7 and dil H2SO4 solution, turns it green, the gas is -: a)H2S b) NH3 c) Cl2 d) SO2
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A gas when passes through ${{K}_{2}}C{{r}_{2}}{{O}_{7}}$ and dil. ${{H}_{2}}S{{O}_{4}}$ solution turns it green, the gas is:
A.$C{{O}_{2}}$
B.$N{{H}_{3}}$
C.$S{{O}_{2}}$
D.$C{{l}_{2}}$
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