What is the decrease in volume of air when pyrogallol is shaken with 30.00cm3 of air ?

What is the decrease in volume of air when pyrogallol is shaken with 30.00cm³ of air ?

A 15.00cm³
B 6.30cm³
C 0.63cm³
D 0.06cm³

jamb 2001 chemistry

The correct answer is B. 6.30cm³

% volume of O₂ in air = 21%

â´ (21/100) * 30 = 6.3

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