NCERT -class 11- Chemistry- Unit 5-Thermodynamics Welcome to your NCERT -class 11- Chemistry- Unit 5-Thermodynamics 1. 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.) KOH;△H=−55.6 kJ/mol HBr;△H=−83.3 kJ/mol KNO 3 ;△H=35.4 kJ/mol NaCI;△H=5.35 kJ/mol None 2. For a spontaneous process: entropy change of the system plus surrounding must be positive entropy change of the surrounding must be positive enthalpy change of the system must be negative entropy change of the system must be positive None 3. 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 : 2 1 : 1 None 4. 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 \(−2808 kJ mol^{−1}\) 0.36 kg 0.720 kg 0.18 kg 1.0 kg None 5. The internal energy of a gas in an adiabatic process is given by U=a+bPV find y:- $$\frac{a+1}{a}$$ $$\frac{b+1}{a}$$ $$\frac{b+1}{b}$$ $$\frac{a+1}{b}$$ None 6. 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. $$e\frac{2e}{{\sqrt{mr}}}$$ $$e\frac{e}{{\sqrt{mr}}}$$ $$\frac{2e}{{\sqrt{mr}}}$$ $$\frac{e}{{\sqrt{mr}}}$$ None 7. 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 is 1.5 times as larger as 𝑇 2 𝑇 1 is 2 times as larger as 𝑇 2 𝑇 1 = 𝑇 2 𝑇 2 is twice larger as 𝑇 1 None 8. 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: + 54.61 𝑘 𝐽 − 54.61 𝑘 𝐽 + 77.61 𝑘 𝐽 − 77.61 𝑘 𝐽 None 9. 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: △ 𝐻 ≃ 0 △ 𝑆 = − 𝑉 𝑒 △ 𝐺 = − 𝑉 𝑒 △ 𝑆 = + 𝑣 𝑒 None 10. △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: zero -2.27 Kcal/mol -1.135 Kcal/mol -9.44 Kcl/mol None 11. 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 12. 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? +8.43 J +580.43 J +458.43 J +43 J None 13. 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 14. When we take acetone in a test tube it feels cold. Which reaction occurs in the process? adiabatic process reversible process endothermic reaction exothermic reaction None 15. 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 90 𝑘 𝐽 48 𝑘 𝐽 900 𝑘 𝐽 100 𝑘 𝐽 None 16. 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 −71030 cal −70 cal − 70960 𝑐𝑎𝑙 None 17. 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 18. For reaction A→B, ΔH and ΔS are positive. the most favourable condition of spontaneous process. very low temperature low temperature high concentration high temperature None 19. A quantity that cannot be directly measured is: heat of formation of \(𝐻_{2}O(l))/ latent heat of fusion of ice heat of combustion of ethyl alcohol heat of formation of\(C𝐻_{4}(g))/ None 20. 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___________. 30.0 𝑘 𝐽 42.5 𝑘 𝐽 40.0 𝑘 𝐽 37.5 𝑘 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.
