Which type of rock would chemically weather more rapidly marble or gneiss and why

The answer Varies

Explanation:

If you look at the Mohs hardness scale that could also help you & the rocks composition.

marble is less porous and slightly stronger than limestone, but still less durable than granite. (Google)

Take comfort in knowing that gneiss can withstand heavy use; it is made up of minerals in the 6-7 range on Mohs scale, meaning it's harder than glass and about the same hardness as steel.(Google)

Hardness: Being composed of calcite, marble has a hardness of three on the Mohs hardness scale. As a result, marble is easy to carve, and that makes it useful for producing sculptures and ornamental objects. The translucence of marble makes it especially attractive for many types of sculptures. (Google)

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.