Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Input: Consider Input: Collision frequency is greater for homogeneous category of catalysts, which also tend to be more sensitive to temperature and more 'expensive'.

Output: Collision frequency is greater for what category of catalysts, which also tend to be more sensitive to temperature and more 'expensive'?


Input: Consider Input: Landslides moving loose rocks downhill process is the best example of a sudden change to earth’s surface.

Output: Which process is the best example of a sudden change to Earth’s surface?


Input: Consider Input: Water-soluble carboxylic acids ionize slightly in water to form these?
Output: Water-soluble carboxylic acids ionize slightly in water to form these?