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100 Liters of air at STP is slowly bubbled through 200ml of 0.03N Ba(OH)2 solution. The Baco3 formed due to reaction is filtered and few drops of phenolphthalein is added to the solution rendering it pink. The solution required 25ml of 0.2N HCL solution when indicator turned colorless. Calculate percentage by volume of c02 in air. The right answer 0.04

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