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Grade: 11
        
A mixture of 10ml CH4, C2H4 and C2H2 has a vapour density of 11.3 . Mixture contains x ml of CH4,  y ml of C2H4 and z ml of C2H2. When 30 ml of oxygen are sparked together over aqueous KOH, the volume contracts to 5.5ml and then disappears when pyrogallol is introduced. If volumes are measured in same conditions of pressure, temperature and humidity, value of x, y and z are
 
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