Chemistry
Give a chemical test to distinguish between SO2 and Cl2.
Practical Chemistry
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Answer
On passing Sulphur dioxide gas through lime water, it turns lime water milky.
Ca(OH)2 + SO2 ⟶ CaSO3 ↓ [white ppt.] + H2O
Chlorine gas does not turn lime water milky. It turns moist starch iodide paper blue black.
Cl2 + 2KI ⟶ 2KCl + I2
Starch + I2 ⟶ Blue black colour
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(b) turns moist red litmus blue
(c) does not affect acidified K2Cr2O7 paper but turns lime water milky.
(d) affects acidified K2Cr2O7 paper and also turns lime water milky.