________ balls capable of grinding the feed in a ball mill gives the maximum efficiency?

What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope?

A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is________?

If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is________?

When a gas is subjected to adiabatic expansion, it gets cooled due to________?

Fixed carbon in coal is defined as________?