Title 07. EQUILIBRIUM.pdf ✅

(1.) When ice and water kept in a beaker at 273 K and at the atmospheric pressure, then both processes occurs simultaneously [Page: 193] Ice → Water Water → Ice Which of the following is incorrect (a) These are in dynamic equilibrium. (b) Both the processes occur at the same rate. (c) The amount office and water remains constant. (d) None of these. (2.) CaCO CaO CO 3 2 + reaction in a lime kiln goes to completion because [Page: 193] (a) CaO does not react to CO2 to give CaCO3 (b) Backward reaction is very slow (c) CO2 formed escapes out (d) None of these (3.) Which of the following is not associated with equilibrium conditions [Page: 193] (a) The vapour pressure of liquid (b) The formation of an alloy by two metals (c) The solubility of a solute (d) The distribution of coefficient of a solute between two immiscible solvent (4.) Boiling point of a liquid can be increased by [Page: 194] (a) Increasing atmospheric pressure (b) Decreasing atmospheric pressure (c) Going at high altitude (d) Boiling point is fixed for a substance, it cannot be increased. (5.) Which of the following is a characteristic of a reversible reaction [Page: l96] (a) It never proceeds to completion. (b) It proceeds only in the forward direction. (c) The rate of only forward reaction is increased when catalyst is added. (d) Number of moles of reactants and products is the same. (6.) Which of the following is a general characteristic of equilibria involving physical processes [NCERT Exemplar Modified, Page: 196] (I) Equilibrium is possible only in a closed system at a given temperature. (II) All the physical processes stop at equilibrium.
(III) All measurable properties of the system remain constant. [Page: l96] Which of the given statements are correct? (a) I & II only (b) I & III only (c) II & III only (d) All of the above (7.) For the given reaction, equilibrium can be reached A + B C + D [Page: 196] (a) When only A and B are initially present (b) When only C and D are initially present (c) Any of these (d) None of these (8.) Check the given graphs carefully. Which of the following statements is correct about these graphs [Page: 196] (a) Graph I represents variation in product concentration with time. (b) Graph II represents variation in product concentration with time. (c) Graph II represents variation in reactant concentration with time. (d) Graph II represents reaction at equilibrium. (9.) Match Column I with Column II. [QR code, NCERT Exemplar Modified, Page: 196] Column I Column II P Solid Liquid (I) Boiling point Q Liquid Vapour (II) Saturated solution R Solid Vapour (III) Melting point S Solute(s) Solute(solution) (IV) Sublimation point (a) P‐I, R‐ IV, Q‐III, S‐II (b) P‐II, Q‐ III, R‐IV, S‐I (c) P‐ IV, Q‐III, R‐I2 Q‐ II (d) P‐ III, Q‐ I, R‐IV, S‐II (10.) For the reaction N 3H 2NH 2 2 3 + in a vessel, after the addition of equal number of moles of N2 and , 2 H equilibrium state is formed. Which of the following is correct?. [Page: 198]
(a) H N 2 2  =   (b) H N 2 2     (c) H N 2 2     (d) N H NH 2 2 3  = =     (11.) 3.00 mol of pure 3 SO is kept in an 8 L flask at 1000 K. At equilibrium 0.58 mol of O2 has been formed. Then the value of equilibrium constant is 3 2 2 2SO 2SO O+ [Page: 199] (a) 0.144 (b) 0.230 (c) 2 2.88 10−  (d) 2 0.14 10−  (12.) For the reaction H I 2HI 2 2 + , the equilibrium concentrations of H , I 2 2 and HI are 5.0, 2.5 and 25 mol/L respectively. The equilibrium constant is [Page: 199] (a) 10 (b) 4 (c) 50 (d) 0.04 (13.) A vessel of one litre capacity containing 1 mole of 3 SO is heated till a state of equilibrium is attained: ( ) ( ) ( ) 3 2 2 2SO g 2SO g O g + At equilibrium, 0.4 moles of 2 SO has formed. The value of equilibrium constant is [Page: 199] (a) 0.04 (b) 0.06 (c) 0.09 (d) 0.12 (14.) A higher value of equilibrium constant K shows that[Page: 199] (a) the reaction takes time to start (b) the reaction has gone near to completion towards left (c) the reaction has gone near to completion towards right (d) none of these. (15.) For the reaction, A B C D + + if initially the concentrations of A and B are both equal but at equilibrium concentration of D will be twice of thar of A, then what will be the equilibrium constant of the reaction. [Page: l99] (a) 9 / 4 (b) 4 (c) 4 / 9 (d) 1 / 4 (16.) For the reaction, ( ) ( ) ( ) ( ) H S g I s 2HI g S s 2 2 + + concentration of H S2 is 0.25 M and HI is 0.5 M, then value of K c is [Page: l99] (a) 1 (b) 0.25 (c) 0 (d) 1 / 2
(17.) The rate constant for forward and backward reactions of hydrolysis of ester are 2 1.1 10−  and 3 1.5 10−  per minute. Then equilibrium constant for the reaction will be [Page: l99] CH COOC H H CH COOH 3 2 5 3 + + C H OH 2 5 + (a) 4.33 (b) 5.33 (c) 6.33 (d) 7.33 (18.) If the concentration of OH− ions in the reaction ( ) ( ) ( ) ( ) 3 3 Fe OH s Fe aq 3OH aq + + is decreased by 1 / 4 times, then the equilibrium concentration of 3 Fe + will be increased by [Page: 199] (a) 4 times (b) 1 / 4 times (c) 10 times (d) 64 times (19.) 5 3 PCl , PCl and Cl2 are at equilibrium at 500 K in a closed container and their concentrations are 1 2 8 10 mol / L,1.2 10 mol / L − −   and 0.6 2 10 mol / L −  respectively. Then value of K c for ( ) ( ) ( ) 5 3 2 PCl g PCl g Cl g + is [NCERT Exemplar Modified, Page: 199] (a) 2 1.2 10−  (b) 5 9 10−  (c) 3 2.5 10−  (d) 6 3 10−  (20.) The equilibrium constant for the reaction: [Page: 199] 2A 3B 2C + → will be (a)      2A 3B 2C (b)       2 2 A 3B C (c)      2C 2A 3C (d)       2 2 2 C A B (21.) The equilibrium constant K for the reaction [Page: 201] ( ) ( ) ( ) 2 2 1 CO g CO g O s 2 + is 9 1.67 10 at 500K. −  Then the value of equilibrium constant for the reaction, ( ) ( ) ( ) 2 2 2CO g O g 2CO g + → , is (a) 17 3.58 10  (b) 8 6 10  (c) 9 1.67 10−  (d) 18 3.58 10−  (22.) Consider the following reactions: [Page: 20l] I. ( ) ( ) ( ) AB g 1/ 2B g AB g 2 2 3 + II. ( ) ( ) 3 2 2 2AB g 2AB B g +