D- Physical
Explanation:
A physical property is anything that has characteristics associated with a change in it's chemical composition
Atoms do not always contain the same number of electrons and protons, although this state is common. When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral. In contrast, when an atom loses or gains an electron (or the rarer case of losing or gaining a proton, which requires a nuclear reaction), the total charges add up to something other than zero.
This is due to the solubility of CO₂ in blood is more than the solubility of Oxygen in blood
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