Acetylene must be dissolved in a solvent to be safely stored in a cylinder, while carbon monoxide does not require this but still needs careful handling. Therefore, both gases are noteworthy in terms of safety concerns. The correct option is E, indicating both C (Acetylene) and D (Carbon Monoxide). ;
The gas that must be dissolved in a solvent for safe storage in a cylinder is Acetylene (option C). While Carbon Monoxide (option D) is toxic and requires careful handling, it does not need to be dissolved. Therefore, the correct answer is C.
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