GURUKUL STUDY CENTRESub: Chem - II Marks:35Std: XIIth ( ch-03 ) (Chemical Thermodynamics & Energetics) Q1) Multiple choice Questions (7) 1) Entropy of the universe---------- a) tends towards maximum b) tends towards minimum c) remains constant d) tends to be zero 2) Homogeneous system consists of ---------- a) two phase b) three phase c) four phase d) only one phase 3) Which of the following is an intensive property? A) enthalpy b) mass c) Temperature d) Volume 4) Which of following relationships is correct? A) H = U-PV b) H= U + P + V c) H = U + PV d) H = -U + PV 5) Which of following is not a state function? A) Internal energy b) Enthalpy c) work d) Entropy 6) A system , which can exchange mass as well as energy with its surroundings is called as-------- a) Isolated system b) open system c)closed system d) inert system. 7) for a chemical reaction = 0.035 KJ/k and -20KJ. At what temperature does the reaction turn non- spontaneous? A) 5.14K b) 57.14K c) 571.4K d) 5714.0K Q2) short answer Questions ( any 6) (12) 1) 6.24 g of ethanol are vapourized by supplying 5.89KJ of heat energy. What is enthalpy of Vaporization of ethanol? 2) Define system and surroundings. 3) What is reversible process? What are its features? 4) A free expansion of a gas results in no work? Explain. 5) Define enthalpy. At constant pressure show that = + P 6) What is spontaneous process, Give examples 7)Define cibbs energy and change in Gibbs energy . What are the units of Gibbs energy? 8) Define i)exothermic reaction ii) Endothermic reaction Q3) Answer the following questions ( any3) (9) 1) State and define the types of systems depending on nature of boundary. 2) Distinguish between isothermal process and adiabatic process. 3) State and explain Hesss law of constant heat summation 4) calculate the maximum work when 24g of oxygen are expanded isothermally and reversibly from a pressure of 1.6 x 105 KPa to 100 298K Q4) long answer Questions ( any 1) (7) 1) Derive an expression for maximum work obtained during reversible and isothermal expansion of an ideal gas are compressed isothermally and reversibly to a volume of 2L The work done is 2.983 KJ at 220C calculate the initial volume of the gas.