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

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.

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

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

The correct statement regarding entropy is,

Identify the correct statement regarding entropy.