The order of these from smallest to largest is the following:
Hemoglobin is a molecule that is present in the blood cell. This molecule helps in binding oxygen with blood. It has four places to bind four molecules of oxygen at once.
Water molecules are formed by binding oxygen and hydrogen. A virus is an entity that becomes alive when it found any host cell. A skin cell is a normal eukaryotic cell, that is present in every multicellular organisms.
A grain of salt will be the largest of all those because, all those things above-mentioned cannot be seen without a microscope, but a grain of salt is visible without a microscope.
Thus, the correct order is:
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