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Lijeeshkumar/model paperCHEMISTRYCHEMICAL KINETICS, SURFACE CHEMISTRY& EQUILIBRIUM 1.For the reaction, 2x + y → z, the following kinetics data was obtained :[x][y]d[z] (mol ) (mol ) (mol )4.01.01.04.04.02.01.04.01.0The rate expression is:a)kb)c)d)e)2.In the first order reaction 75% of the reactant disappeared in 1.38 h, the rate constant of the reaction isa)3.6 × b)2.8 × c)17.2 × d)1.8 × e)1.2×3.The rate constant, activation energy, and Arrhenius parameter of a chemical reaction at 250C are 3.0 × , 104.4 kj and 6.0 × respectively. The value of the rate constant as T → ∞ is:a)2 × b)6.0 × c)infinityd)6.0 × e)04.In a reversible reaction, 2NO2 N2O4, the rate of disappearance of NO2 is equal toa)b)c)d)e)5.For a chemical reaction, A → B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of the reaction with respect to A isa)2b)1c)Zerod)1/2e)36.When a bio- chemical reaction is carried out in laboratory , outside the human body in absence of enzyme , then rate of reaction obtained is times, the activation energy of reaction in the presence of enzyme isa)6/RTb)P is requiredc)Different from obtained in laboratory d)Both are same e) Can’t say anything 7.The first order rate constant for the decomposition of N2O5 is 6.2 × . The of the decomposition is a)1117.7 secb)111.7 secc)228.4 secd)168.9 sece)100 sec8.The activation energy of a chemical reaction can be determined bya)evaluating rate constant at two different temperatureb)changing concentrations of reactantsc)evaluating rate constant at standard temperatured)evaluating velocities of reaction at two different temperaturese) Activation energy of a chemical reaction is constant 9.The rate of a first order reaction is 1.5× mol m at 0.5M concentration of the reactant . The half-life of the reaction isa)0.383 minb)23.1 minc)8.73 mind)7.53 mine)5.34 min10.The reaction A → B follows first order kinetics. The time taken for 0.8 mole of A produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to 0.675 moles of B?a)1 hourb)0.5 hourc)0.25 hourd)2 houre)3 hour11.The solubility of A2X3 is y mol dm−3. Its solubility product isa)6y4b)64y4c)36y5 d) 16 e)108y512.The following equilibrium constants are given: ⇌2 ; , ⇌2 ; , ⇌2 O ; The equilibrium constant for the oxidation of by oxygen to give NO is a) b) c) d) e) 13.A 0.2 molar solution of formic acid is 3.2% ionized. Its ionization constant is a) 9.6 × b) 2.1 × c) 1.25 × d) 4.8 × e) 6 × 14.The first and second dissociation constants of an acid A are 1.0 × and 5.0 × respectively. The overall dissociation constant of the acid will be a) 5.0 × b) 0.2 × c) 5.0 × d) 5.0 × e) 6× 15.At 800C distilled water has hydronium ion (H3O+)concentration equal to 1 × mol . The value of at this temperature would bea)1 × b)1 ×c)1 × d) 1 ×e)1 × 16.Formation of SO3 takes place according to the Reaction 2 SO2 + O2 ⇌ 2 SO3, ∆ H = −45.2 kcal Which of the following factors favours formation of SO3?a)Decrease in pressureb)Increase in pressurec)Removal of oxygend)Increase in volumee)Increases in temperature17.For the equilibrium MgCO3 (s) ⇌ MgO (s) + CO2 (g)Which of the following expression is correcta) b) c) d) e) Kp= 18.Equal volumes of the following and solutions are mixed . In which of the solutions will precipitation occur ? 1. + 2. + 3.+ 4. + Select the correct answer the code given belowa)In 4 onlyb)In 1 & 2c)In 3& 4d)In 2.3 & 4e)In all 19.2 mole of is mixed with 6 mole of in a closed vessel of 1 litre capacity. If 50% of is converted into at equilibrium, the value of for the reaction is a) 4/27b) 27/4c) 1/27d) 27e) 920.pH of a solution produced when an aqueous solution of pH = 6 is mixed with an equal volume of an aqueous solution of pH = 3 is abouta) 4.5 b) 4.0c) 3.3d) 4.3e) 5.021.Substances which behave as normal electrolytes in solutions at low concentrations and exhibit colloidal properties at higher concentrations , are calleda)lyophilic colloidsb)emulsionsc)macromolecular colloidsd)associated colloidse)gels22.Adsorption of gaseous on solid surface is generally exothermic becausea)enthalpy is positive b)entropy decreasesc)entropy increasesd)free energy increasese) enthalpy is negative23.Which of the following is correct about lyophilic sol?a)They are irreversibleb)They are formed by inorganic substancec)They are readily coagulated by addition of electrolytesd)They are self-stabilisede)all of these24.Which of the following form micelles in aqueous solution above certain concentration?a)Glucoseb)Ureac)Dodecyl trimethyl ammonium chlorided)Pyridinium chloridee) ammonium chloride25. At the critical micelle concentration (CMC) the surfactant molecules a)associate b)dissociatec)decomposed)become completely solublee)Insoluble 26.Plot of log x/m against log P is a straight line inclined at an angle of 45° . When the pressure is 0.5 atm and Freundlich parameter , k is 10 , the amount of solute adsorbed per gram of adsorbent will be (log 5= 0.6990)a)1gb)2gc)3gd)5ge)2.5g27.Which of the following ions can cause coagulation of proteins?a) b) c) d) e) 28.The coagulation of 200mL of a positive colloid took place when 0.73g HCl was added to it without changing the volume much. The flocculation value of HCl for the colloid is a) 0.365b) 36.5c) 100d) 150e) 20029.Shape –selective catalyst is a reaction catalysed by a)zeolitesb)enzymesc)platinumd)Zeigler-Natta catalyste)Silica30. Statement : “To stop bleeding from an injury, ferric chloride can be applied.” Which comment about the statement is justified ?a)It is not true ; ferric chloride is a poisonb) It is not true ; ions coagulate blood which is a negatively charged solc)It is not true ; ions form positively charged sol ; profuse bleeding takes placed)It is true; coagulation takes place because of formation of negatively charged sol with e)It is not true ; ferric chloride is ionic and gets into the blood streamASSIGNMENT1.A first order reaction is 10% complete in 20 min. the time taken for 19% completion isa)30 minb)40 minc)50 mind)38mine)45 min2.For the reaction 2A + B → 3C + DWhich of the following does not express the reaction rate?a)b) c) d) e) 3.Consider the reaction N2(g) +3 H2(g) → 2 NG3(g) The equality relationship between and − isa) = − b) = − c) = − d) = − e) = − 4.The following mechanism has been proposed for the reaction of NO with Br2 to form NOBr :NO(g) + Br2(g) → NOBr2(g), NOBr2(g) + NO(g) → 2NOBr(g). If the second step is the rate determining step, the order of the reaction with respect to NO (g) isa)1b)0 c)3 d)2 e)45.The reaction of hydrogen and iodine monochloride is given as:H2(g) + 21CI(g) → 2HCI(g) + l2(g). This reaction is of first order with respect to H2(g) and ICI(g), following mechanism were proposed :Mechanism A : H2(g) 2ICI(g) → 2HCI(g) + l2(g)Mechanism B : H2(g) + ICI(g) → HCI(g) + HI(g) ;slow HI(g) + ICI(g) → HCI(g) + l2(g) ; fast. Which of the above mechanism (s) can be consistent with the given information about the reactiona)A onlyb)B onlyc) both 1 and 2 d)Neither 1 nor 2 e) a or b6.The energies of activation for forward and reverse reactions for A2 + B2 ⇌ 2AB are 180 kJ mol−1 and 200 kJ mol−1 respectively. The presence of catalyst lowers the activation energy of both (forward and reverse) reactions by 100 kJ mol−1. The enthalpy change of the reaction (A2 + B2 → 2AB) in the presence of catalyst will be (in kJ mol−1)a)300b)120 c)280d)−20e)1007.Which of the following electrolyte will be most effective in coagulation of gold sol?a)NaNO3b)K4c)Na3PO4d)MgCI2e)both a and c8.A plot of log (x/m) vs. log P for adsorption of a gas on a solid gives a straight line with slop equal toa)log Kb)− log K c)nd) e)−n e) remains insoluble9.Alums purify muddy water bya)dialysisb)absorptionc)coagulation d)forming true solutione) adsorption10.Cellulose dispersed in ethanol is calleda)emulsion b)micellec)collodiond)hydrophilic sole)gel11.which one of the following is lyphilic colloid?a)Milkb)Gumc)Fogd)Bloode)latex12.The value of the equilibrium constant of the reaction HI (g) ⇌ H2 (g) + l2(g) is 8.0. The equilibrium constant of the reaction H2 (g) + l2 (g) ⇌ 2 HI (g) will bea)1/16b)1/1c)16d)1/8e)1/6413.The values of K1 and KP2 for the reactionsX ⇌ Y +Z …..(1) and A ⇌ 2B …..(2) are in the ratio of 9 : 1. If the degree of dissociation of X and A be equal, then total pressure at equilibrium (1) and (2) are in the ratioa)1 :3b)1 : 9 c)36 : 1d)1 :1e)3 : 114.At 250C, the dissociation constant of a base, BOH, is 1.0 × . The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be:a)1.0 × b)1.0 × mol c)2.0 × mol d)1.0 × mol e)1.0 ×15.Number of ions present in 250 mL of lemon juice of pH=3 is a)1.506 × b) 1.506 × c) 1.506 × d) 3.012 × e) 2.008×TIPS TO REMEMBERDispersed PhaseDispersed Medium Common NameExamplesGasLiquidFoamWhipped cream , soap , latherGasSolidSolid foamPumice stone , bread, foam rubber , occludedLiquidGasAerosolClouds, mists, fogs, insecticide spraysLiquidLiquidEmulsionMilk, codliver oilLiquidSolidGelChees, jellies, curd, boot polishSolidGasSolid foamSmoke, duststormSolidLiquidSolMud, sol, metallic solsSolidSolidSolid solColoured glass, percious stones, alloys,minerals, pearls