When 10 cm3 of A was mixed at room temperature with 50 cm3 of oxygen (an excess)
and exploded, 40 cm3 of gas remained after cooling the apparatus to room temperature
and pressure.
When this 40 cm3 of gas was shaken with an excess of aqueous potassium hydroxide,
KOH, 30 cm3 of gas still remained.
(i) What is the identity of the 30 cm3 of gas that remained at the end of the
experiment?
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