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Ozone an estimated in air by passing cer...

Ozone an estimated in air by passing certaing volume of air through an acidified or neutral or basic KI solution when `O_(2)` is evolved and `I^(ɵ)` is oxidised to `I_(2)`. Free `I_(2)` evolved is titrated with standard `Na_(2)S_(2)O_(3)` solution. In an experiment 10 L of air at 1 atom and `27^@C` was passed through an alkaline KI solution and `I_(2)` liberated requried 2 " mL of " `(M)/(800)Na_(2)S_(2)O_(3)` solution. Calculate the volume percentage of `O_(3)` in sample.

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The correct Answer is:
`1.847 xx 10^(-3)%`
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