Question

# 1000L of air at STP was dissolved in water and required 2.5×10−5 moles of KMnO4 for complete reaction of SO2 at pollutants. Thus, SO2 content in air is :

A
1.4ppm
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B
14ppm
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C
2.8ppm
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D
6.25ppm
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Solution

## The correct option is A 1.4ppmGiven:1000L of air is dissolved at Standard Temperature Pressure into Water and then requires 2.5 x 10−5 moles of KMnO4 for complete reaction of SO2 which is dissolved in Water.Solution:Eqn 1:SO2 + H2O → H2SO3 Eqn2:2MnO−4+2H2SO−3→5H2SO−4+2Mn2+It implies 2 moles of MnO4 requires 5 moles of SO2.Therefore, 2.5 x 10−3 moles of KMnO4 requires = 52 x 2.5 x 10−3 moles of SO2 = 6.25 x 10−3 molesAt STP, 6.25 x 10−3 moles = 6.25 x 22.4 x 10−3 =1.4 x 10−3LIn 1000L, 1.41000 x 10−3 = 1.4 ppm.So, the Correct option : A

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