NCERT -class 11- Chemistry- Unit 5-Thermodynamics Welcome to your NCERT -class 11- Chemistry- Unit 5-Thermodynamics 1. When a bottle of perfume is opened, odorous molecules mix with air and slowly diffuse throughout the entire room. The incorrect fact about the process is: △ 𝐺 = − 𝑉 𝑒 △ 𝑆 = − 𝑉 𝑒 △ 𝐻 ≃ 0 △ 𝑆 = + 𝑣 𝑒 None 2. In an ice calorimeter, a chemical reaction is allowed to occur in thermal contact with an ice-water mixture at 0ºC Any heat liberated by the reaction is used to melt some ice; the volume change of the ice-water mixture indicates the amount of melting. When solutions containing 1.0 millimole each of AgNO3 and NaCl were mixed in such a calorimeter, both solution having been pre-cooled to 0ºC, 0.20 g of ice-melted. Assuming complete reaction in this experiment, what is ΔH for the reactions:$$Ag^{+}(aq) +Cl^{-}(aq)\rightarrow AgCl(s)$$Latent heat of fusion of ice at 0ºC is 80 cal/g. −16 cal +16 cal +16 kcal −16 kcal None 3. Which of the following salts shall cause more cooling when one mole of the salt is dissolved in the same amount of water ? (Integral heat of solution at 298 K is given for each solute.) NaCI;△H=5.35 kJ/mol KNO 3 ;△H=35.4 kJ/mol KOH;△H=−55.6 kJ/mol HBr;△H=−83.3 kJ/mol None 4. For reaction A→B, ΔH and ΔS are positive. the most favourable condition of spontaneous process. high concentration very low temperature low temperature high temperature None 5. A solution of 500 ml of 2 M−KOH is added to 500 ml of 2 M−HCl and the mixture is well shaken. The rise in temperature 𝑇1 is noted. The experiment is again performed using 250ml of each solution and rise in temperature 𝑇2 is again noted. Which of the following is correct? 𝑇 1 = 𝑇 2 𝑇 1 is 2 times as larger as 𝑇 2 𝑇 1 is 1.5 times as larger as 𝑇 2 𝑇 2 is twice larger as 𝑇 1 None 6. The heats of combustion of rhombic and monoclinic sulphur are −70960−70960 and −71030−71030 calorie respectively. What will be the heat of conversion of rhombic sulphur to monoclinic sulphur? +70 cal −70 cal −71030 cal − 70960 𝑐𝑎𝑙 None 7. A quantity that cannot be directly measured is: latent heat of fusion of ice heat of formation of\(C𝐻_{4}(g))/ heat of combustion of ethyl alcohol heat of formation of \(𝐻_{2}O(l))/ None 8. Heat of reaction for the equation, A(s)+B(g)→2C(g) is 40 𝑘𝐽 at 300 𝐾 at constant volume. Hence, heat of reaction at constant pressure and at 300 𝐾 is___________. 37.5 𝑘 𝐽 40.0 𝑘 𝐽 42.5 𝑘 𝐽 30.0 𝑘 𝐽 None 9. If an electron is moving in an orbit with total energy $$ U= -\frac{e^{2}}{r}r $$is radius of the orbit then find the speed of the electron. $$e\frac{2e}{{\sqrt{mr}}}$$ $$\frac{2e}{{\sqrt{mr}}}$$ $$\frac{e}{{\sqrt{mr}}}$$ $$e\frac{e}{{\sqrt{mr}}}$$ None 10. A piston filled with 0.04 mole of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0°C. As it does so, it absorbs 207 J of heat. The values of q and W for the process will be :[Take : R = 8.314 J / mol K, In 7.5 = 2.01] q = +207, W = -207 q = +207, W = +207 q = -207, W = -207 q = -207, W = +207 None 11. A swimmer coming out from a pool is covered with a film of water weighing about 18 g. Calculate the internal energy of vaporisation at 100°C. [\(ΔH_{vap}\) for water at 373 K = 40.66 kJ/mol ]The correct option is: 37.56 kJ 35.67 kJ 36.64 kJ None of the above None 12. For a specific work, on an average a person requires 5616 kJ of energy. How many kilogram of glucose must be consumed if all the require energy has to be derive from glucose only? ΔH for combustion of glucose is \(−2808 kJ mol^{−1}\) 0.18 kg 1.0 kg 0.720 kg 0.36 kg None 13. The value of \(△H_{sol}\( of anhydrous copper (II) sulfate is −66.11 kJ. Dissolution of 1 mole of blue vitriol (Copper (II) sulphate pentahydrate) is followed by absorption of 11.5 kJ of heat. The enthalpy of dehydration of blue vitriol is: + 77.61 𝑘 𝐽 − 77.61 𝑘 𝐽 − 54.61 𝑘 𝐽 + 54.61 𝑘 𝐽 None 14. △G of the conversion of 2 mol of C_{6}H_{6} (I) at 80ºC (normal boiling point) to vapour at the same temperature and a pressure of 0.2 atm is: -9.44 Kcl/mol -2.27 Kcal/mol -1.135 Kcal/mol zero None 15. For an ideal solution containing two liquid components A and B, the Gibbs free energy of mixing is minimum, when the molar ratio of the liquids is 1 :10 1 : 1000 1 : 1 1 : 2 None 16. The heat capacity of a bomb calorimeter is 300 J/K. When 0.16𝑔𝑚 of methane was burnt in this calorimeter the temperature rose by 3º𝐶. The value of △𝑈 per mole will be 900 𝑘 𝐽 100 𝑘 𝐽 90 𝑘 𝐽 48 𝑘 𝐽 None 17. For a spontaneous process: enthalpy change of the system must be negative entropy change of the surrounding must be positive entropy change of the system plus surrounding must be positive entropy change of the system must be positive None 18. When we take acetone in a test tube it feels cold. Which reaction occurs in the process? endothermic reaction reversible process adiabatic process exothermic reaction None 19. The internal energy of a gas in an adiabatic process is given by U=a+bPV find y:- $$\frac{b+1}{a}$$ $$\frac{a+1}{a}$$ $$\frac{b+1}{b}$$ $$\frac{a+1}{b}$$ None 20. 500 J of heat was supplied to a system at constant volume.It resulted in the increase of temperature of the system from 20ºC to 25ºC. What is the change in internal energy of the system? +580.43 J +458.43 J +43 J +8.43 J None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
