Which law of thermodynamics helps in calculating entropy at different temperatures?

Fill in the blanks given below:
$(i)$ : The scientist who stated that the entropy of a perfectly crystalline substance decreases with a decrease in temperature is .......
$(ii)$ The statement that the entropy of a perfectly pure crystalline substance is zero at absolute zero temperature represents the .... law of thermodynamics.
$(iii)$ The entropy of one mole of a substance at a fixed temperature and standard state is called ..........
$(iv)$ The unit of molar entropy is .........

If the entropy of a solid is greater than zero at $T = 0 \ K$,it is called:

The law formulated by Dr. Nernst is

The entropy of crystalline substances at absolute zero,according to the third law of thermodynamics,should be taken as:

The entropy of a perfectly crystalline solid at absolute zero is