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

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

State the third law of thermodynamics.

Fill in the blanks:
$(i)$ The standard enthalpy of formation of any element in its reference state is considered to be $.........$.
$(ii)$ The scientist $.........$ stated that the entropy of a perfectly crystalline substance decreases with a decrease in temperature.
$(iii)$ At absolute zero temperature,the entropy of a perfectly crystalline substance is zero. This statement represents the $.........$ law of thermodynamics.

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

Identify the correct statement regarding entropy.