A mixture of 10 cm$^3$ of methane and 10 cm$^3$ of ethane was sparked with an excess of oxygen. After cooling, the residual gas was passed through aqueous potassium hydroxide.
All gas volumes were measured at the same temperature and pressure.
Which volume of gas was absorbed by the alkali?
1 )
15 cm$^3$
2 )
20 cm$^3$
30 cm$^3$
4 )
40 cm$^3$
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