Difficult
$120 \ g$ of an organic compound that contains only carbon and hydrogen gives $330 \ g$ of $CO_{2}$ and $270 \ g$ of water on complete combustion. The percentage of carbon and hydrogen,respectively,are ...... .
- A$25$ and $75$
- B$40$ and $60$
- C$60$ and $40$
- D$75$ and $25$
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