Question

Assertion:The chemical potential of pure water at normal temperature and pressure is zero.
Reason: In Solution, the value of water potential is usually positive.
A. Both Assertion and Reason are correct and Reason is that the correct explanation for Assertion
B. Both Assertion and Reason are correct and Reason isn't the proper explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect

Answer 1

Hint : ‘Pure’ water like water free from each and each sort of bacteria and viruses, Water could be a compound made up of hydrogen and oxygen. Pure water would be water, and it contains nothing but hydrogen and oxygen

Complete Step By Step Answer:
The chemical potential of water can be defined as the free energy per mole of water. It is simply the potential for a substance to react or move. Work results when force applied on an object causes it to move.
First let’s understand how chemical potential varies. So, the chemical potential $\mu$ is not a material constant, but depends upon temperature, pressure, etc.
water in its liquid state and has the weakest tendency to transform. Water freezes in the cold and evaporates in the heat. The potentials of the initial water as well decrease as a result of an increase of temperature. This means if there is increase in temperature then chemical potential decreases.
Now, as previously stated, the value of the chemical potential of a substance depends not only upon temperature, but upon pressure as well. Moreover, the potential generally increases when the pressure increases.
Hence, if we analyze, then increase in temperature and increase in pressure will not allow chemical potential to change.
Now we know that water always moves from high to lower water potential. This potential at normal temperature and pressure is zero. This is because the presence of solid particles reduces the free energy of water and decreases its potential. This however is considered the highest value.
Therefore, the chemical potential of pure water is always zero and for solutions it is less than zero or has negative value.
With this we get the chemical potential of water as:
${\sum _i}{\mu _i} = 0$
Thus, the correct answer is C. Assertion is correct but Reason is incorrect.

Note :
The water potential of pure water is often at normal temperature, it's not under any pressure, which is understood as zero by convention. Pure water has the capacity to dissolve numerous substances in great amounts, therefore pure water almost does not exist in nature.