The entropy of a perfectly crystalline solid at absolute zero is

State the third law of thermodynamics.

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

Describe the absolute entropy and the third law of thermodynamics.

The law formulated by Dr. Nernst is

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 .........