(+ C. 0.037 2HI(g); Equilibrium is the exact balancing of two opposing processes. Le Chtelier's principle predicts that a decrease in temperature will ________. Q: Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent? The pH of a solution of boric acid, H3BO3(aq), with Ka = 5.410-10 has been found to have a value of 5.02. Tajikistan, (+ India, (+ Answer 2NH3 (g) N2 (g) + 3H2 (g) Turkey, (+ 41) E) The reaction will go to completion since there are equal amounts of Br2 and Cl2. 233) Q: What is the half-life for this reaction? Q: What can you conclude about the equilibrium constant (K) for the reaction? The best strategy to follow while answering the MCQ Questions for exams is to go through the question as many times as possible and understand it clearly. The forward reaction is favored. D. 12.9 kJ [An aqueous solution contains 32% HCl by mass] B. Thus, by adding a small amount of I2, neither side would be favored since the constant shows that little I2 would be produced. This quantity of heat is equivalent to: information you need to know about E for the system, [The total change in internal energy is the sum of the heat, q, and work, w: E=q+w]. NCERT Solutions and CBSE MCQs will provide you an in-depth understanding of all the questions and concepts in NCERT Textbooks. - The vapor pressure of a liquid increases with increasing temperature. 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 Guinea, (+ 2NH 3 (g) N 2 . Determine the equilibrium concentration, [H3BO3], of this weak acid in the solution. Consider an acetate buffer that is a mixture of 0.20 M acetic acid and 0.20 M sodium acetate. 2 Xs(s) + 3 Xn2+(aq) 2 Xs3+(aq) + 3 Xn(s) . 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. B. A. United Kingdom, (+ Find the equilibrium amounts of these compounds if they all start out at 0.120 M. Solution: Determine Qc so that you know which direction the reaction will proceed. Part B: Calculate the boiling point of the solution above. Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? Q: Find the value of the [H3O+] of rain over the West Coast that has a pH of 5.5. 0.556 From Midterm Exam 2: The equilibrium constant for the formation of hydrogen iodide according to to given equation is K. H2 + I2 2HI Find the equilibrium constant in terms of K for the reaction: HI 1/2 H2 + 1/2 I2 Please explain. C) addition of some to the reaction vessel (V and T constant) D) [H3O+][F-] / [HF] A. H2(g) Consider the following chemical reaction: H2 (g) + I2 (g) <> 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, 0.033 M, and 0.55 M, respectively. Rating: 5 / 5 stars. 32) 25) At 400 K, the equilibrium constant for the reaction United States, (+ - A liquid can be converted to a gas by heating. A. E. 1.62. The NCERT Solutions for the questions are present on our site or you can find them online too. 380) The reaction : N 2O4 2N O2 J & K CET 2018 8. The total number of stars for this article is: 5 in 1 review. 233) C) [SO3]2 / [SO2]2[O2] 93) B. density - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. Identify the change that will always shift the equilibrium to the right. C. 0.322 M What happens to the vapor pressure of a substance when the temperature is increased? 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. A. Swaziland, (+ Chemistry MCQ For Class 12 Chapter savvy with answers Online Test is a sort of Mock Test that will assist you with taking care of the few issues of Std twelfth NCERT Chemistry Books. Which statement describes best the pH of a 0.010 M solution of this acid. 45) C 185 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: 12.30 A -253 48) B. Consider the following reactions and their respective equilibrium constants: From Midterm 3: C) roughly equal amounts of products and reactants are present The reaction mixture will contain [A]=1.0M and [B]=0.1M. C) decrease the value of the equilibrium constant To score well take a stab at rehearsing the rundown of Multiple Choice Type Questions gave in the connections underneath. Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? 27) Substance Hf (kJ/mol) 37.5 g HNO2 4.6104 4) Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide? We hope the given CBSE MCQs for Class 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12th all subjects will help you. 2HI = H2 + I2 | Chemical Equation. Cambodia, (+ A galvanic cell designated as C. Neither direction is favored. (ii) The value of K decreases as the system approaches equilibrium. Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. Hydrogen and nitrogen react to form ammonia according to the following balanced chemical equation: \ce {3H2 (g) + N2 (g) <=> 2NH3 (g)} \nonumber Values of the equilibrium constant at various temperatures were reported as K_ {25C} = 3.3 \times 10^8, K_ {177C} = 2.6 \times 10^3, and K_ {327C} = 4.1. Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. C. The bonds that break and those that form are of approximately the same strength. D. increase reactant E. +4087 J mol-1, From Midterm Exam 2: 2SO2 (g) + O2 (g) 2SO3 (g) C) The equilibrium partial pressure of Br2 will be greater than 1.00 atm. An analyte containing 0.12 L of a 0.025 M solution of a strong acid is titrated with a 0.220 M solution of a strong base. C) at low temperature and low pressure Belgium, (+ 2COF2(g)CO2(g)+CF4(g), Kc=6.30 The equilibrium constant K p is independent of (A) Total pressure (B) Catalyst (C) The amounts of H 2 and I 2 present However, it changes with Temperature A. BF3 B. HPO42- 971) 973) If you have any queries regarding The Solid State CBSE Class 12 Chemistry MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon. A. ion-ion By rehearsing more second Year Chemistry MCQs with Answers Pdf Download, understudies can work on their speed and exactness which can help them during their board test. It is a common experience that on a calm, sunny day one can hear voices of persons in a boat over great distances. B. increase volume Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. is Keq = 4.34 10-3 at 300 C. 968) -4.56C C-H 414 A. \mathrm{~Pb}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Pb}(\mathrm{s}) & \text { voltage }=-0.13 \mathrm{~V} \\ What is the rate constant, k, for this reaction in units of L mol-1 s-1. SiO2(s) + 4 HF(g) SiF4(g) + 2 H2O(l) Hrxn = -184 kJ 2003-2023 Chegg Inc. All rights reserved. Hrxn= npHf(products) nrHf(reactants) A) [H+][HCO3-] / [CO2] D. 1.72 J/(g C), The temperature rises from 25.00C to 29.00C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. A. 93) Georgia, (+ 230) 351) C. 12.28 Determine the value of the missing equilibrium constant. [Suppose that 1.10 g of rubbing alcohol (C3H8O)] 100.0C (i) The value of K increases as the system approaches equilibrium. Oman, (+ 91) What is dynamic equilibrium? 3.48 J/(g C) Which metal in the list is the best reducing agent? Refer to the list of electrode potentials below to answer parts a to d. Ag+(aq)+eAg(s)voltage=+0.80VCo2+(aq)+2eCo(s)voltage=0.28VCu2+(aq)+2eCu(s)voltage=+0.34VPb2+(aq)+2ePb(s)voltage=0.13VZn2+(aq)+2eZn(s)voltage=0.76V\begin{array}{ll} After a sufficiently long time, [A] will approach zero, regardless of the values of k and k'. E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25C, what is the osmotic pressure of the resulting solution? Hydrogen and iodine react to form hydrogen iodide, like this: H_2 (g) + I_2 (g) rightarrow 2 HI (g) Also, a chemist finds that at a certain temperature the equilibrium mixture of hydrogen, iodine, and hydrogen iodide has the following composition: Calculate the value of the equilibrium constant K_p for this reaction. For the comforts of the understudies we have furnished the part savvy Chemistry MCQs with replies here. Consider the first-order decomposition of compound A according to B. Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction is higher than the rate of the reverse reaction. 48) H2 (g) + I2 (g) 2HI (g) 971) 10) The Keq for the equilibrium below is 7.52 10-2 at 480.0 C. HC2H3O2 1.8105] C. 1.94 where n represents the stoichiometric coefficients] A. B. D. 6.36 torr Georgia, (+ (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. D. Nothing can be concluded about K from Ecell. 46) After the reaction reaches equilibrium, the total pressure is 2.65 atm.] C. K>1 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. Russia, (+ Check all that apply. A. 64) B) reactants predominate Nepal, (+ A. Sweden, (+ A) products predominate A. E) decrease the partial pressure of CO, D) increase the value of the equilibrium constant, 34) Consider the following reaction at equilibrium. C. The anomaly of carbon dioxide is that it has a CP but no TP. H2 (g) + I2 (g)-- > < -- 2HI(g) H=-10.4 kJ. B. 234) B. 07 H2(g) Nonmetal Gas 2 00 L container and goes to equilibrium at 200 oC 00 L container and goes to equilibrium at 200 oC. 233) Moreover, access the Chapter Wise MCQs of Class 12 Chemistry and set up the points and subtopics in it. is given by, 21) The equilibrium constant for the gas phase reaction C) roughly equal amounts of products and reactants are present 992) Consider a cell that is built using the following two half-reactions, 960) Additionally, you can reconsider all Chemistry sections appropriately whenever and save significant season of yours during class tests and yearly tests readiness. 2CH3NO2(l)+3/2O2(g)2CO2(g)+3H2O(l)+N2(g) Hrxn = -1418 kJ] Ukraine, (+ Hrxn = ? Q: What is the mole fraction of hexane? 263) B. 348) Use these reactions and their equilibrium constants to predict the equilibrium constant for the following reaction: (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. E) [NH3]2[H2Se] / [(NH4)2Se], 17) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? 351) mmmmmmmH2 + mmlI2 mll2HI I/molL-1:ml1.000mm1.000mml1.000 C/molL-1:mm-xmmmll-xmmml+2x E/molL-1:m1.000-xm1.000-xm1.000+2x Q: What is the [H3O+] in pure water at body temperature? Understudies who are getting ready for Online/Offline Tests/Contests in Chemistry for class 12. Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. Afghanistan, (+ United States, (+ Determine the value of the missing equilibrium constant. 0.13 M C. 4.3 M D. 0.039 M 992) Understudies who are concentrating in CBSE, ICSE, IGCSE schools as well as different State Board schools. The reaction mixture will contain [A]=0.1M and [B]=1.0M. Q: How much heat is produced by the complete reaction of 4.05 kg of nitromethane? 41) A) 5.4 10-13 [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] D) [SO3]2 / [SO2]2[O2]2 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 ? Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture (R = 0.0821 L atm/ (K mol)) A. Kc depends on how the chemical equation is written, but not on how the reaction is carried out. 355) 1-propanol Or if any of the following reactant substances I2 (iodine), disappearing [A redox reaction has an Ecell=1.00V] 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ +238 kJ Switzerland, (+ A. 2A(g) + 2B(g) A2B2(g) Kc = 28.2. For both acid and base, 'strong' means fully dissociated. C. The reaction mixture will contain equal concentrations of A and B. E) only reactants are present, 22) The equilibrium constant for the gas phase reaction 966)