Which of the following state functions is not zero at the standard state?

Identify the correct statement regarding entropy.

State the third law of thermodynamics.

State the third law of thermodynamics.

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 .........

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