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A mixture of 5% gas and 95% air has the potential to burn because it contains a sufficient concentration of flammable gas that can mix with oxygen present in the air to support combustion. In general, flammable gases require a specific range of concentrations to ignite, known as the flammability range or explosive limits.

The mixture mentioned falls within a range that allows for combustion under the right conditions, such as a source of ignition. When ignited, the gas can react with oxygen in the air, resulting in a fire.

Other options suggest different outcomes such as not burning, exploding, or just igniting. However, while a 5% gas concentration is not excessively high, it is still adequate for combustion to occur when exposed to an ignition source. Therefore, the selection of burning as the appropriate outcome aligns with the principles of combustion and flammability associated with gas-air mixtures.