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

Q: The core of a star collapses during a supernova, forming a neutron star.

A: The core of a star collapses during what event, forming a neutron star?
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Q: Fractional crystallization is the separation of compounds on the basis of their solubilities in a given solvent.

A: What is the separation of compounds on the basis of their solubilities in a given solvent?
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Q: As per the kinetic-molecular theory, in random directions direction do the molecules and ions of liquids move.

A:
As per the kinetic-molecular theory, in what direction do the molecules and ions of liquids move?
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