Plz explain this question

Solution: 

Water in the free state means only water (H2O) is present, here there are no other molecules or atoms associated with the water molecule. For in case of ever water, lake water, spring water, seawater, etc, here only the free state of water is present.

The combined state of water means the water molecule is associated with some other salt and this is written in the formula of that salt. Like when MgCl2 is present in the air, the water molecules in the air get reacted with this and get attached to this, hence the formula will now be changed into MgCl2.6H2O. Now, here in this case water is no longer a free compound it gets combined with magnesium chloride.

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