Consider the following statements about the properties of perfect non reacting gas mixtures:1) The total volume of a mixture is the sum of partial volumes at the same pressure and temperature.2) The entropy of a mixture of gases is the same as the entropies of the constituents.3) The total pressure of a mixture of gases is the sum of the partial pressures of the substances.4) The mole fraction of a mixture of gases is equal to both pressure and volume fraction.Which of the above statements is/are correct?

• A. 1, 2, 3 and 4
• B. 1, 2 and 3 only
• C. 1, 2 and 4 only
• D. 3 and 4 only