State the third law of thermodynamics.

At what temperature is the entropy of a perfectly crystalline substance considered to be zero?

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 .........

Identify the correct statement regarding entropy.

Identify the correct statement regarding entropy.

The entropy of a perfectly crystalline solid at absolute zero is