These various decision inquiries for twelfth class Chemistry will help you to improve calculated and subject information abilities. Q: What is the percent ionization of ammonia at this concentration? D) increase the value of the equilibrium constant 233) France, (+ 46) In each table, there may be one statement that is false because it contradicts the other three statements. Q: At what temperature does benzene boil when the external pressure is 460 torr ? 224) 49) C. OH- 880) Nigeria, (+ The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: C. 0.037 E. 0.158. 32) 44) A. Solution Verified by Toppr Correct option is D) For the reaction, H 2(g)+I 2(g)2HI(g), the number of moles of gaseous reactants is equal to the number of moles of gaseous products. D. -150. kJ C. -16.0 kJ Which of the following statements is TRUE? United Kingdom, (+ B) reactants predominate [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] Finland, (+ A. [The decomposition of SO2Cl2SO2Cl2 is first order in SO2Cl2SO2Cl2 and has a rate constant of 1.46104 s1s1 at a certain temperature] B) [CO2] / [H+][HCO3-] Zimbabwe. Q: What is the [H3O+] in pure water at body temperature? A galvanic cell designated as . If the temperature is raised, then the forward reaction is favored. C) 2 SO3 (g) 2 SO2 (g) + O2 (g) D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture If the value for K = 2.1 X10-2 at 730 K, which substance predominates, HI or H2 and I2 H2 + I2 = 2 HI Since there is an equal number of each element in the reactants and products of H2 + I2 = 2HI, the equation is balanced. 44) D) 5.66 10-3 46) United States, (+ 7154 A) products predominate B) N2 (g) + O2 (g) 2NO (g) C. raising the temperature 968) H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . Answer is Keq = 2.80 102 at 999 K. At equilibrium, ________. CH3Cl(g)+Cl2(g)CH2Cl2(g)+HCl(g), H=105.8 kJ, Use the standard reaction enthalpies given below to determine Hrxn for the following reaction: Q: Calculate the molality of the solution. Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. For the comforts of the understudies we have furnished the part savvy Chemistry MCQs with replies here. 100.0C Belgium, (+ 6 H2(g) + 6 D2(g) 12 HD(g) Kc = ? The final temperature of the mixture upon reaching thermal equilibrium is 27.9 C] Q: What is the value of the equilibrium constant, Kp, for the reaction? 995) D. CO The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). C) 7.07 . 224) C) roughly equal amounts of products and reactants are present E) Q is the same as Keq when a reaction is at equilibrium. B) the rates of the forward and reverse reactions are equal. E) -50, 14) Given the following reaction at equilibrium, if Kc = 1.90 1019 at 25.0 C, Kp = ________. Nepal, (+ (a) total pressure(b) catalyst used(c) amount of H2 and I2(d) temperature, (a) 2 10-4(b) 4 10-2(c) 2 10-2(d) 1 10-2, (a) bar min-1, bar2 min-1(b) bar min-1, bar1/2 min-1(c) bar1/2 min-1, bar2 min-1(d) bar min-1, bar1/2 min-1, (a) 9 times(b) 4 times(c) 16 times(d) 8 times, (a) NH4NO2 N2 + 2H2O(b) NO + O3 NO2 + O2(c) 2NO + Br2 2NOBr(d) CH3CHO CH4 + CO, (a) mol L-1 s-1(b) s-1(c) mol-2 L s-1(d)mol L-1, (a) (i)2, (ii) 1(b) (i)2,(ii) 2(c) (i) 1, (ii) 1(d) (i) 1, (ii) 2, (a) temperature of the reaction(b) extent of the reaction(c) initial concentration of the reactants(d) the time of completion of reaction, (a) Rate = k [O] [O3](b) Rate = k [O3] [O2]-1(c) Rate = k [O3](d) Rate = k [O2] [O], (a) zero order reaction(b) first order reaction(c) second order reaction(d) third order reaction, (a) order of a reaction(b) molecuiarity of a reaction(c) fast step of the mechanism of a reaction(d) half-life of the reaction, (a) the order and molecuiarity of the slowest step are equal to one(b) molecuiarity of the reaction can be zero, one or two(c) molecuiarity of the reaction can be determined only experimentally(d) more than one reacting species are involved in one step, (a) the order and molecuiarity of the slowest step are equal to one, (a) the rate of fastest intermediatestep(b) the sum total of the rates of all intermediate steps(c) the average of the rates of all the intermediate steps(d) the rate of slowest intermediate step, (d) the rate of slowest intermediate step, (a) temperature(b) mechanism of reaction as well as relative concentration of reactants(c) molecularity(d) pressure, (b) mechanism of reaction as well as relative concentration of reactants, (a) inversely proportional to the concentration units(b) independent of concentration units(c) directly proportional to concentration units(d) inversely proportional to the square of concentration units, (a) 2 10-2 s-1(b) 4 10-4 s-1(c) 20 s-1(d) 2 10-4 s-1, (a) EaR(b) Ea2.303R(c) 2.303Ea.R(d) Ea2.303, (a) mol L-1s-1(b) s-1(c) L mol-1s-1(d) L2mol-2s-1, (a) triple(b) increase by a factor of 4(c) double(d) remain unchanged. B. CP is always at a higher temperature relative to TP. C. 2.13 10-14 E. 1.62. (i) The value of K increases as the system approaches equilibrium. A. -4.56C B) increase the equilibrium constant so that products are favored Portugal, (+ E. Xe. United Kingdom, (+ D. CH3OH, D. CH3OH C. 62.5C How is vapor pressure related to temperature? [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. 995) Albania, (+ B. (Remember that 101.3 J = 1 L atm) India, (+ D) [H3O+][F-] / [HF] Swaziland, (+ C. N(g) 992) Chemistry MCQ For Class 12 Chapter keen with Answers are a huge resource for the board test arranging. What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with K a = 3.5 10-8? E) in the presence of solid carbon, 35) The effect of a catalyst on an equilibrium is to ________. 263) The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. A. Erxn can be determined using constant volume calorimetry. Moreover very advantageous for the promising new kids in town have completed their outline for the term 1 test 2021-22. 41) A. 2NH3 (g) N2 (g) + 3H2 (g) A. BF3 34) For both acid and base, 'strong' means fully dissociated. The molar mass of sugar is 342.3 g/mol. The concentration [A] was measured at two different times: at t1 = 19.4 s the concentration of A was [A]1 = 0.62 M and at time t2 = 60.8 s the result was [A]2 = 0.31 The value of pH is somewhat higher than 6.65. United States, (+ Ag+(aq)+eAg(s)Co2+(aq)+2eCo(s)Cu2+(aq)+2eCu(s)Pb2+(aq)+2ePb(s)Zn2+(aq)+2eZn(s)voltage=+0.80Vvoltage=0.28Vvoltage=+0.34Vvoltage=0.13Vvoltage=0.76V. You can likewise reconsider all Chemistry sections appropriately and save time during your group tests and tests. - A gas can be converted into a liquid by cooling. D) only products are present 351) NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. Even though metal is a good conductor, frost can be seen on parked cars in the early morning even when the air temperature is above freezing. B. 2CH3NO2(l)+3/2O2(g)2CO2(g)+3H2O(l)+N2(g) Hrxn = -1418 kJ] We reviewed their content and use your feedback to keep the quality high. From Midterm Exam 2: 107 g . Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. E. 0.371, From Midterm Exam 2: The lightbulb is turned on for 0.015 h, and the assembly expands from an initial volume of 0.90 L to a final volume of 5.89 L against an external pressure of 1.0 atm] D) 2500 XaO4-(aq) + 4 H+(aq) + 3 e-(aq) XaO2(s) + 2 H2O(l) . United Arab Emirates, (+ What would the molar concentration of the tree sap have to be to achieve this pressure on a day when the temperature is 31 C ? (look up carbon dioxide phase diagram), Which of the following compounds is most soluble in hexane (CH3CH2CH2CH2CH2CH2CH3)? B. where n represents the stoichiometric coefficients] C. K>1 Afghanistan, (+ Q: Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent? E) The reaction is at equilibrium when Q = Keq. An equilibrium mixture contains 2 moles of sulphur dioxide, 1 mole of oxygen and 6 moles of sulphur trioxide. Note: Names of real elements have been changed to 'Xd'. After the reaction reaches equilibrium, the total pressure is 2.65 atm.] 355) - A gas can be converted into a liquid by decreasing the pressure of a gas sample. Part C: Calculate the change in the internal energy of the system, E. 2SO2 (g) + O2 (g) 2SO3 (g) -333 kJ - A liquid can be converted to a gas by heating. D. Nothing can be concluded about K from Ecell. C. Neither direction is favored. Which statement is true at equilibrium? New Zealand, (+ C) 5.4 1013 91) 34) Calculate Erxn for the combustion of sucrose in kJ/mol sucrose. New Zealand, (+ Which of the following is NOT a conjugate acid-base pair? A. 44) A 250 mL sealed flask contains 0.65 g of butane at 22C.] C. The value of K remains, but the equilibrium is shifted towards more reactants. Essentt - Handpicked Products. Note: Names of real elements have been changed to 'Xs' and 'Xo'. [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] (+ 358) Which of the following is TRUE if E sys = - 115 J? is given by, 21) The equilibrium constant for the gas phase reaction Comprehend the ideas and practice Objective Type Questions for twelfth Class Chemistry however much you can to score well. D) only products are present Denmark, (+ 49) D) N2 (g) + 3H2 (g) 2NH3 (g) B. 348) Calculate the equilibrium constant for the following reaction at 25C: H 2(g) +I 2(g) 2H I (g) . 41) 0.13 M C. 4.3 M D. 0.039 M For the reaction : 2HI(g) H2 (g)+ I2 (g), the degree of dissociated () of HI(g) is related to equilibrium constant Kp by the expression: For the reaction H2(g) + I2(g) 2HI(g) the equilibrium constant kp changes with. C) N2 (g) + 3H2 (g) 2 NH3 (g) A) 25 B. E. In equilibrium, the ratio [P] / [A] is equal to k / k'. Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. 855) To have a decent groundwork for your impending board test then you should endeavor these internet based tests for Chemistry. B. H2SO3/HSO3- E. There is not enough information to calculate the Kw. 4CuO (s) + CH4 (g) CO2 (g) + 4Cu (s) + 2H2O (g), 20) The equilibrium-constant expression for the reaction 30.5 C D. 6.36 torr The statements in the tables below are about two different chemical equilibria. B. B. NCERT CBSE KVS Class 12 Chemistry MCQs will assist the children with reinforcing ideas and further develop marks in tests and tests. 90) - A gas can be converted into a liquid by cooling. What is the rate constant, k, for this reaction in units of L mol-1 s-1. 380) At equilibrium, ________. b. User Agreement,Privacy Policy A. M. What is the half-life, t1/2, for this reaction in units of seconds ? Tap on the individual Chapter connection of twelfth Standard Chemistry you need to practice and profit the comparing points MCQ Quiz Questions. Mauritius, (+ (Methanol ( CH3OH ) contains hydrogen directly bonded to oxygen, so it has hydrogen bonding. If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium? Oman, (+ [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] Q: What is the mass of the silver block? 64) The equilibrium constant (K ) would be __________. For H2O, Hfus = 6.01 kJ/mol, and Hvap = 40.67 kJ/mol. Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. 2 HD(g) H2(g) + D2(g) Kc = 0.28 E. 8.89. 31) Egypt, (+ D. 39.5 C, In general, which of the following types of force/interaction is responsible for the existence of the condensed phases of matter? Q: If the initial concentration of SO2Cl2 is 1.00 M, how long will it take for the concentration to decrease to 0.72 M ? The symbols have their usual meaning, for example AG stands for the standard Gibbs free energy of reaction and K stands for the equilibrium constant. What is the primary source of water stored in an aquifer? What is the value of Keq for the following reaction? Sn(s)|Sn2+(aq)NO(g)|NO3(aq),H+(aq)|Pt(s), 3Sn(s)+2NO3(aq)+8H+(aq)3Sn2+(aq)+2NO(g)+4H2O(l), [Use tabulated half-cell potentials to calculate Grxn for each of the following reactions at 25 C] 971) [Nickel and aluminum electrodes are used to build a galvanic cell. =1.33x10-3 M and [H+] = 1.33x10-3M The equilibrium constant, K eq, for the ionization of acetic acid at 25 C is _____. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction Test your critical thinking abilities by noting the Chemistry Multiple Choice Questions with Answers for Class 12 PDF all alone. For benzoic acid, Ka=6.5105. E. All of these have intermolecular forces stronger than dispersion. CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) - A gas can be converted into a liquid by increasing the pressure of a gas sample. What is the value of Keq at this temperature for the following reaction? 973) C) K does not depend on the concentrations or partial pressures of reaction components. \end{array} The equilibrium-constant expression depends on the _____ of the reaction. Note: Names of real elements have been changed to 'Xs' and 'Xo'. 355) 10 C) roughly equal amounts of products and reactants are present Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. C) roughly equal amounts of products and reactants are present 52) 12.72 52) A sample of NO gas was introduced into a container such that the initial partial pressure of NO was 560 torr. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Hydrogen iodide undergoes decomposition according to the equation 2HI (g) H2 (g) + I2 (g) The equilibrium constant Kp at 500 K for this equilibrium is 0.060. Guinea, (+ CBSE Textbooks can be great to guide you for any exam and has detailed solutions for the questions.
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