JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank

done Catalyst and Catalysis Total Questions - 74

• question_answer1)
  Mark the correct statement in a reversible reaction [CPMT 1974; EAMCET 1978, 79; MP PMT 1993]
  A)
                  The catalyst catalyses the forward reaction done clear
  B)
                  The catalyst catalyses the backward reaction done clear
  C)
                  The catalyst influences the direct and the reverse reaction to the same extent done clear
  D)
                  The catalyst increases the rate of forward reaction and decreases the rate of backward reaction done clear
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• question_answer2)
  A catalyst is used                                              [CPMT 1989]
  A)
                  Only for increasing the velocity of the reaction done clear
  B)
                  For altering the velocity of the reaction done clear
  C)
                  Only for decreasing the velocity of the reaction done clear
  D)
                  All A, B and C are correct done clear
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• question_answer3)
  A catalyst is a substance which   [NCERT 1981; CPMT 1996]
  A)
                  Alters the equilibrium in a reaction done clear
  B)
                  Is always in the same phase as the reactants done clear
  C)
                  Participates in the reaction and provides easier pathway for the same done clear
  D)
                  Does not participate in the reaction but speeds it up done clear
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• question_answer4)
  In Haber's process for the manufacture of ammonia [AMU 1984; CPMT 1974, 90]
  A)
                  Finely divided iron  is used as catalyst done clear
  B)
                  Finely divided molybdenum is used as catalyst done clear
  C)
                  Finely divided nickel is used as catalyst done clear
  D)
                  No catalyst is necessary done clear
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• question_answer5)
  When \[KCl{{O}_{3}}\] is heated, it decomposes into \[KCl+{{O}_{2}}\]. If some \[Mn{{O}_{2}}\] is added, the reaction goes much faster because [CPMT 1971,76,80,94]
  A)
                  \[Mn{{O}_{2}}\] decomposes to give \[{{O}_{2}}\] done clear
  B)
                  \[Mn{{O}_{2}}\] provides heat by reacting done clear
  C)
                  Better contact is provided by \[Mn{{O}_{2}}\] done clear
  D)
                  \[Mn{{O}_{2}}\] acts as a catalyst done clear
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• question_answer6)
  In the reaction \[2S{{O}_{2}}+{{O}_{2}}\underset{A{{s}_{2}}{{O}_{3}}}{\mathop{\xrightarrow{Pt}}}\,2S{{O}_{3}}\], \[A{{s}_{2}}{{O}_{3}}\] acts as a [MP PET 1995]
  A)
                  Autocatalyst       done clear
  B)
                  Poison done clear
  C)
                  Promotor            done clear
  D)
                  Positive catalyst done clear
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• question_answer7)
  Reactions in Zeolite catalysts depend on               [BHU 2000]
  A)
                  Pores    done clear
  B)
                  Apertures done clear
  C)
                  Size of cavities   done clear
  D)
                  All of these done clear
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• question_answer8)
  What is the role of a catalyst in a catalysed reaction [MP PMT 1996; Pb. PMT 2000;UPSEAT 2001,02]
  A)
                  Lowers the activation energy done clear
  B)
                  Increases the activation energy done clear
  C)
                  Affects the free energy change done clear
  D)
                  Affects the enthalpy change done clear
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• question_answer9)
  The catalyst used in the lead chamber process of sulphuric acid manufacture is [CPMT 1977]
  A)
                  Platinum              done clear
  B)
                  Oxide of nitrogen done clear
  C)
                  Nickel    done clear
  D)
                  Vanadium compounds done clear
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• question_answer10)
  In the following reaction the catalyst used is                                                                 [AMU (Engg.) 1999]
  A)
                  \[A{{l}_{2}}{{O}_{3}}\]   done clear
  B)
                  \[C{{r}_{2}}{{O}_{3}}\] done clear
  C)
                  \[C{{r}_{2}}{{O}_{3}}\] and \[A{{l}_{2}}{{O}_{3}}\]             done clear
  D)
                  Zn dust done clear
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• question_answer11)
  Enzymes with two sites are called            [AIIMS 2002]
  A)
                  Apoenzyme       done clear
  B)
                  Holoenzyme done clear
  C)
                  Allosteric enzyme            done clear
  D)
                  Conjugate enzyme done clear
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• question_answer12)
  Which of the following types of metals make the most efficient catalysts                                              [DPMT 1985]
  A)
                  Alkali metals       done clear
  B)
                  Transition metals done clear
  C)
                  Alkaline?earth metals    done clear
  D)
                  Radioactive metals done clear
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• question_answer13)
  An example of autocatalytic reaction is  [NCERT 1983]
  A)
                  The decomposition of nitroglycerine done clear
  B)
                  Thermal decomposition of \[KCl{{O}_{3}}\] and \[Mn{{O}_{2}}\] mixture done clear
  C)
                  Break down of \[_{6}{{C}^{14}}\] done clear
  D)
                  Hydrogenation of vegetable oil using nickel catalysts done clear
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• question_answer14)
  In the case of auto catalysis                                         [KCET (Med.) 2002]
  A)
                  Solvent catalyses done clear
  B)
                  Product catalyses done clear
  C)
                  Reactant catalyses           done clear
  D)
                  Heat produced in the reaction catalyses done clear
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• question_answer15)
  In a reversible reaction, a catalyst will affect the rate of [KCET (Med.) 2002]
  A)
                  Forward reaction             done clear
  B)
                  Reverse reaction done clear
  C)
                  Forward and reverse reaction done clear
  D)
                  Neither A nor B done clear
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• question_answer16)
  The role of a catalyst in a reversible reaction is to [KCET (Med.) 2001]
  A)
                  Increase the rate of forward reaction done clear
  B)
                  Decrease the rate of backward reaction done clear
  C)
                  Alter the equilibrium constant of the reaction done clear
  D)
                  Allow the equilibrium to be achieved quickly done clear
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• question_answer17)
  The catalyst used in the contact process for manufacturing of sulphuric acid is    [MP PMT 1987]
  A)
                  Copper done clear
  B)
                  Iron/aluminum oxide done clear
  C)
                  Vanadium pent oxide    done clear
  D)
                  Platinized asbestos done clear
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• question_answer18)
  For the functioning of enzymes which of the following statements is not correct               [MP PMT 2000]
  A)
                  An optimum temperature is needed done clear
  B)
                  An optimum pH is needed done clear
  C)
                  They are substrate specific done clear
  D)
                  They always increase activation energy done clear
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• question_answer19)
  When a catalyst is added to a system the              [JIPMER 2000]
  A)
                  Value of equilibrium constant is decreased done clear
  B)
                  The rate of forward reaction is increased and that of backward reaction is decreased done clear
  C)
                  Equilibrium concentrations are unchanged done clear
  D)
                  Equilibrium concentrations are increased done clear
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• question_answer20)
  A catalyst can affect reversible reaction by           [CPMT 2002]
  A)
                  Changing equilibrium done clear
  B)
                  Slowing forward reaction done clear
  C)
                  Attaining equilibrium in both direction done clear
  D)
                  None of these done clear
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• question_answer21)
  \[\underset{\text{Sucrose}}{\mathop{{{C}_{12}}{{H}_{22}}{{O}_{11}}}}\,+{{H}_{2}}O\xrightarrow{dil.\,{{H}_{2}}S{{O}_{4}}}\underset{\text{Fructose}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6\,}}(aq)}}\,+\underset{\text{Glucose}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}(aq)}}\,\]                 In this reaction, dilute \[{{H}_{2}}S{{O}_{4}}\] is called    [AFMC 1997]
  A)
                  Homogeneous catalysis done clear
  B)
                  Homogeneous catalyst done clear
  C)
                  Heterogeneous catalysis              done clear
  D)
                  Heterogeneous catalyst done clear
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• question_answer22)
  Which one of the following statement is wrong in case of enzyme catalysis          [MP PMT 1985, 2001]
  A)
                  Enzymes work best at an optimum temperature done clear
  B)
                  Enzymes work at an optimum \[pH\] done clear
  C)
                  Enzymes are highly specific for substances done clear
  D)
                  An enzyme raises activation energy done clear
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• question_answer23)
  Which of the following catalyses the conversion of glucose into ethanol [CPMT 1983, 84; CBSE PMT 1989; KCET 1993]
  A)
                  Zymase done clear
  B)
                  Invertase done clear
  C)
                  Maltase                done clear
  D)
                  Diastase done clear
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• question_answer24)
  Which of the following is used as a catalyst in the manufacture of toluene from benzene with \[C{{H}_{3}}Cl\] [CPMT 1985]
  A)
                  \[Ni\]    done clear
  B)
                  Anhydrous \[AlC{{l}_{3}}\] done clear
  C)
                  \[Pd\]   done clear
  D)
                  \[Pt\] done clear
  View Solution play_arrow

• question_answer25)
  Hydrolysis of ethyl acetate is catalysed by aqueous [MP PMT 2002]
  A)
                  \[N{{a}_{2}}S{{O}_{4}}\]               done clear
  B)
                  \[{{K}_{2}}S{{O}_{4}}\] done clear
  C)
                  \[{{H}_{2}}S{{O}_{4}}\]  done clear
  D)
                  \[BaS{{O}_{4}}\] done clear
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• question_answer26)
  Which of the following statements about a catalyst is true [AIIMS 1996]
  A)
                  It lowers the energy of activation done clear
  B)
                  The catalyst altered during the reaction is regenerated done clear
  C)
                  It does not alter the equilibrium done clear
  D)
                  All of these done clear
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• question_answer27)
  Which of the following statements is true for a catalyst
  A)
                  It increases the energy of the reactants done clear
  B)
                  It decreases the energy of the products done clear
  C)
                  It decreases the energy of the reactants done clear
  D)
                  It does not change the enthalpy of the reactants done clear
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• question_answer28)
  Which is not a characteristic of a catalyst               [AFMC 1992]
  A)
                  It changes the equilibrium constant done clear
  B)
                  It alters the reaction path done clear
  C)
                  It increases the rate of reaction done clear
  D)
                  It increases the average K.E. of the molecules done clear
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• question_answer29)
  Which one of the following statements is correct in reversible reaction. A catalyst            [MP PET 1994; EAMCET 1987]
  A)
                  Increases the rate of forward reaction done clear
  B)
                  Decreases the rate of forward reaction done clear
  C)
                  Increases the rate of backward and forward reactions done clear
  D)
                  Alters the equilibrium constant of the reaction done clear
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• question_answer30)
  A catalyst             [MNR 1987; UPSEAT 2002]
  A)
                  Increases the free energy change in the reaction done clear
  B)
                  Decreases the free energy change in the reaction done clear
  C)
                  Does not increase or decrease the free energy change in the reaction done clear
  D)
                  Can either increase or decrease the free energy change depending on what catalyst we use done clear
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• question_answer31)
  Which one of the following changes when catalyst is used in a reaction
  A)
                  Heat of reaction               done clear
  B)
                  Product of reaction done clear
  C)
                  Equilibrium constant       done clear
  D)
                  Activation energy done clear
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• question_answer32)
  In the reversible reaction a catalyst is the substance which [CBSE PMT 1992]
  A)
                  Increases the rate of the forward reaction done clear
  B)
                  Decreases the value of enthalpy change in the reaction done clear
  C)
                  Reduces the time required for reaching the equilibrium state in the reaction done clear
  D)
                  Decreases the rate of the reverse reaction done clear
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• question_answer33)
  In the titration between oxalic acid and acidified potassium permanganate, the manganous salt formed catalyses the reaction. The manganous salt is [KCET 1992]
  A)
                  A promoter        done clear
  B)
                  A positive catalyst done clear
  C)
                  An autocatalyst done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer34)
  Which one of the following statements is incorrect in the case of heterogeneous catalysis            [CPMT 1990]
  A)
                  The catalyst lowers the energy of activation done clear
  B)
                  The catalyst actually forms a compound with the reactant done clear
  C)
                  The surface of the catalyst plays a very important role done clear
  D)
                  There is no change in the energy of activation done clear
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• question_answer35)
  Regarding criteria of catalysis which one of the following statements is not true [CPMT 1990]
  A)
                  The catalyst is unchanged chemically at the end of the reaction done clear
  B)
                  A small quantity of catalyst is often sufficient to bring about a considerable amount of reaction done clear
  C)
                  In a reversible reaction the catalyst alters the equilibrium position done clear
  D)
                  The catalyst accelerates the reaction done clear
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• question_answer36)
  Which of the following reaction is catalysed by enzyme maltase                                                [MP PMT 2003]
  A)
                  Starch ® maltose            done clear
  B)
                  Maltose ® glucose done clear
  C)
                  Lactose ® maltose         done clear
  D)
                  Maltose ® glucose + fructose done clear
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• question_answer37)
  The efficiency of an enzyme in catalysing a reaction is due to its capacity                                               [NCERT 1982]
  A)
                  To form a strong enzyme-substrate complex done clear
  B)
                  To decrease the bond energies of substrate molecule done clear
  C)
                  To change the shape of the substrate molecule done clear
  D)
                  To lower the activation energy of the reaction done clear
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• question_answer38)
  A catalyst in a chemical reaction [BHU 1998]
  A)
                  Does not initiate a reaction done clear
  B)
                  Increases the activation energy of the reaction done clear
  C)
                  Changes the equilibrium constant of a reaction done clear
  D)
                  Does not change the rate of the reaction done clear
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• question_answer39)
  Platinized asbestos is used as a catalyst in the manufacture of \[{{H}_{2}}S{{O}_{4}}\]. It is an example of [CPMT 1975]
  A)
                  Heterogeneous catalyst                done clear
  B)
                  Autocatalyst done clear
  C)
                  Homogenous catalyst    done clear
  D)
                  Induced catalyst done clear
  View Solution play_arrow

• question_answer40)
  Catalyst used in hydrogenation of oils is [CPMT 1975; MNR 1986; DPMT 1982, 85;BHU 1973, 87; EAMCET 1987; AFMC 1993; CET Pune 1998]
  A)
                  \[Pt\]    done clear
  B)
                  \[Mo\] done clear
  C)
                  \[Fe\]    done clear
  D)
                  \[Ni\] done clear
  View Solution play_arrow

• question_answer41)
  Addition of catalyst in a system [MP PMT 1992]
  A)
                  Increases equilibrium concentrations done clear
  B)
                  No effect on equilibrium concentrations done clear
  C)
                  Decreases equilibrium concentrations done clear
  D)
                  Increases rate of forward reaction and decreases rate of backward reaction done clear
  View Solution play_arrow

• question_answer42)
  In which of the following processes, platinum is used as a catalyst            [NCERT 1978, 79]
  A)
                  Oxidation of ammonia to form nitric acid done clear
  B)
                  Hardening of oils done clear
  C)
                  Production of synthetic rubber done clear
  D)
                  Synthesis of methanol done clear
  View Solution play_arrow

• question_answer43)
  Enzymes are      [CPMT 1974, 81]
  A)
                  Micro-organisms              done clear
  B)
                  Proteins done clear
  C)
                  Inorganic compounds    done clear
  D)
                  Moulds done clear
  View Solution play_arrow

• question_answer44)
  Protons accelerate the hydrolysis of esters. This is an example of             [MP PMT 1987]
  A)
                  A heterogeneous catalysis done clear
  B)
                  An acid-base catalysis done clear
  C)
                  A promoter done clear
  D)
                  A negative catalyst done clear
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• question_answer45)
  Which of the following processes does not involve a catalyst [KCET 1991; AIIMS 1996]
  A)
                  Haber's process                done clear
  B)
                  Thermite process done clear
  C)
                  Ostwald process               done clear
  D)
                  Contact process done clear
  View Solution play_arrow

• question_answer46)
  Which of the statement is wrong among the following [AFMC 1993]
  A)
                  Haber's process of \[N{{H}_{3}}\] requires iron as catalyst done clear
  B)
                  Friedel?Craft's reaction uses anhydrous \[AlC{{l}_{3}}\] done clear
  C)
                  Hydrogenation of oils uses iron as catalyst done clear
  D)
                  Oxidation of \[S{{O}_{2}}\] to \[S{{O}_{3}}\] requires \[{{V}_{2}}{{O}_{5}}\] done clear
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• question_answer47)
  A catalyst is a substance which
  A)
                  Increases the rate of a reaction done clear
  B)
                  Increases the amount of the products formed in a reaction done clear
  C)
                  Decreases the temperature required for the reaction done clear
  D)
                  Alters the speed of the reaction remaining unchanged chemically at the end of the reaction done clear
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• question_answer48)
  In the Ostwald's process for the manufacture of \[HN{{O}_{3}}\], the catalyst used is     [AMU 1982, 83; MP PET 1999]
  A)
                  \[Mo\] done clear
  B)
                  \[Fe\] done clear
  C)
                  \[Ni\]    done clear
  D)
                  \[Pt\] done clear
  View Solution play_arrow

• question_answer49)
  A biological catalyst is essentially [NCERT 1978; AFMC 1998]
  A)
                  An amino acid    done clear
  B)
                  A carbohydrate done clear
  C)
                  The nitrogen molecule  done clear
  D)
                  An enzyme done clear
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• question_answer50)
  A catalyst added to a reaction mixture
  A)
                  Increases the equilibrium constant done clear
  B)
                  Decreases the equilibrium constant done clear
  C)
                  Does not change the equilibrium constant done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer51)
  The components of Zigler Natta catalyst, used in the polymerisation of propylene, are                   [MP PMT 2003]
  A)
                  \[TiC{{l}_{3}}+Al{{({{C}_{2}}{{H}_{5}})}_{3}}\]      done clear
  B)
                  \[TiC{{l}_{4}}+Al{{({{C}_{2}}{{H}_{5}})}_{3}}\] done clear
  C)
                  \[Ti{{({{C}_{2}}{{H}_{5}})}_{3}}+AlC{{l}_{3}}\]      done clear
  D)
                  \[Ti{{({{C}_{2}}{{H}_{5}})}_{4}}+AlC{{l}_{3}}\] done clear
  View Solution play_arrow

• question_answer52)
  Which of the following statements regarding catalyst is not true [CPMT 1983, 84;  MNR 1993; KCET 1999]
  A)
                  A catalyst remains unchanged in composition and quantity at the end of the reaction done clear
  B)
                  A catalyst can initiate a reaction done clear
  C)
                  A catalyst does not alter the equilibrium in a reversible reaction done clear
  D)
                  Catalyst are sometimes very specific in respect of reaction done clear
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• question_answer53)
  The enzyme ptylin used for the digestion of food is present in [CPMT 1981]
  A)
                  Saliva     done clear
  B)
                  Blood done clear
  C)
                  Intestine              done clear
  D)
                  Adrenal glands done clear
  View Solution play_arrow

• question_answer54)
  Amongst the following chemical reactions, the one representing homogeneous catalysis is          [MP PMT 1999]
  A)
                  \[{{N}_{2}}(g)+3{{H}_{2}}(g)\xrightarrow{Fe}2N{{H}_{3}}(g)\] done clear
  B)
                  \[2S{{O}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{2NO}2S{{O}_{3}}(g)+2NO(g)\] done clear
  C)
                  \[CO(g)+3{{H}_{2}}(g)\xrightarrow{Ni}C{{H}_{4}}(g)+{{H}_{2}}O\] done clear
  D)
                  \[2S{{O}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{{{V}_{2}}{{O}_{5}}}2S{{O}_{3}}(g)\] done clear
  View Solution play_arrow

• question_answer55)
  Platinised asbestos helps in the formation of \[S{{O}_{3}}\] form \[S{{O}_{2}}\] and \[{{O}_{2}}\]. But, if even a small amount of \[A{{s}_{2}}{{O}_{3}}\] is present the platinised asbestos does not help in the formation of \[S{{O}_{3}}\]. \[A{{s}_{2}}{{O}_{3}}\] acts here as         [MP PMT 1997]
  A)
                  A positive catalyst            done clear
  B)
                  A negative catalyst done clear
  C)
                  An auto catalyst                done clear
  D)
                  A poison done clear
  View Solution play_arrow

• question_answer56)
  Which of the following statements is wrong
  A)
                  Catalysts can aid a rapid reaching of the equilibrium position, but do not change the position of the equilibrium done clear
  B)
                  Homogeneous catalysis generally involves an equilibrium reaction between at least one of the reactants and the catalyst done clear
  C)
                  Heterogeneous catalysis involves chemisorption on the surface of the catalyst done clear
  D)
                  Positive catalysts raise the energy of activation of the reaction they catalyse done clear
  View Solution play_arrow

• question_answer57)
  Which one is false in the following statement [MP PET 1997]
  A)
                  A catalyst is specific in its action done clear
  B)
                  A very small amount of the catalyst alters the rate of a reaction done clear
  C)
                  The number of free valencies on the surface of the catalyst increases on subdivision done clear
  D)
                  \[Ni\] is used as catalyst in the manufacture of ammonia done clear
  View Solution play_arrow

• question_answer58)
  In the redox reaction                 \[2MnO_{4}^{-}+5{{C}_{2}}O_{4}^{2-}+16{{H}^{+}}\]⇌\[2M{{n}^{2+}}+10C{{O}_{2}}+8{{H}_{2}}O\]                 The ion acting as autocatalyst is                 [MP PMT 1986,94]
  A)
                  \[MnO_{4}^{-}\]              done clear
  B)
                  \[{{C}_{2}}O_{4}^{2-}\] done clear
  C)
                  \[{{H}^{+}}\]      done clear
  D)
                  \[M{{n}^{2+}}\] done clear
  View Solution play_arrow

• question_answer59)
  In a homogeneous catalysis
  A)
                  The catalyst and the reactants should be gases done clear
  B)
                  The catalyst and the reactants should form a single phase done clear
  C)
                  Catalyst and the reactants are all solids done clear
  D)
                  The catalyst and the reactions are all liquids done clear
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• question_answer60)
  Which of the following statements is incorrect [CPMT 1985]
  A)
                  Enzymes are in colloidal state done clear
  B)
                  Enzymes are catalysts done clear
  C)
                  Enzymes can catalyse any reaction done clear
  D)
                  Urease is an enzyme done clear
  View Solution play_arrow

• question_answer61)
  Enzymes are      [BHU 1982]
  A)
                  Substances made by chemists to activate washing powder done clear
  B)
                  Very active vegetable catalysts done clear
  C)
                  Catalysts found in organism done clear
  D)
                  Synthetic catalysts done clear
  View Solution play_arrow

• question_answer62)
  Catalyst used in the oxidation of \[S{{O}_{2}}\to S{{O}_{3}}\] [AIIMS 1996]
  A)
                  Nickel    done clear
  B)
                  \[ZnO.C{{r}_{2}}{{O}_{3}}\] done clear
  C)
                  \[{{V}_{2}}{{O}_{5}}\]    done clear
  D)
                  Iron done clear
  View Solution play_arrow

• question_answer63)
  Which requires catalyst [AFMC 1987; MP PET 1999]
  A)
                  \[S+{{O}_{2}}\to S{{O}_{2}}\]     done clear
  B)
                  \[2S{{O}_{2}}+{{O}_{2}}\to 2S{{O}_{3}}\] done clear
  C)
                  \[C+{{O}_{2}}\to C{{O}_{2}}\]     done clear
  D)
                  All done clear
  View Solution play_arrow

• question_answer64)
  The process which is catalysed by one of the products is called   [MP PET 1999; AIIMS 2000; J & K 2005]
  A)
                  Acid-base catalysis          done clear
  B)
                  Autocatalysis done clear
  C)
                  Negative catalysis            done clear
  D)
                  None of these done clear
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• question_answer65)
  Adam's catalyst is                                             [Pb.CET 2001]
  A)
                  Platinum              done clear
  B)
                  Iron done clear
  C)
                  Molybdenum    done clear
  D)
                  Nickel done clear
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• question_answer66)
  A catalyst remains unchanged at the end of the reaction regarding          [MP PET 1995]
  A)
                  Mass done clear
  B)
                  Physical state done clear
  C)
                  Physical state and chemical composition done clear
  D)
                  Mass and chemical composition done clear
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• question_answer67)
  Wilhem Ostwald redefined the action of [Kerala (Med.) 2002]
  A)
                  Anamers              done clear
  B)
                  Isomers done clear
  C)
                  Catalyst done clear
  D)
                  Geometry of monomers done clear
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• question_answer68)
  In a reversible reaction, a catalyst used
  A)
                  Increases the speed of the forward reaction done clear
  B)
                  Decreases the speed of the backward reaction done clear
  C)
                  Does not alter the final state of equilibrium done clear
  D)
                  Increases the amount of the products formed done clear
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• question_answer69)
  Enzyme activity is maximum at [KCET 1989]
  A)
                  300 K     done clear
  B)
                  310 K done clear
  C)
                  320 K     done clear
  D)
                  330 K done clear
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• question_answer70)
  A catalyst is used to                                        [Pb.CET 2000]
  A)
                  Increase the product done clear
  B)
                  Increase or decrease the rate of reaction done clear
  C)
                  Increase or decrease the products done clear
  D)
                  Decrease the products done clear
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• question_answer71)
  The transition metal used as a catalyst is               [Pb. PMT 2004]
  A)
                  Nickel    done clear
  B)
                  Platinum done clear
  C)
                  Cobalt   done clear
  D)
                  All of these done clear
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• question_answer72)
  Which of the following is true about catalyst       [Pb.CET 2000]
  A)
                  It initiates reaction          done clear
  B)
                  It changes equilibrium point done clear
  C)
                  It increase average kinetic energy done clear
  D)
                  It accelerates the rate of reaction done clear
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• question_answer73)
  Which of the following types of metals form the most efficient catalysts               [KCET 2005]
  A)
                  Alkali metals done clear
  B)
                  Alkaline earth metals     done clear
  C)
                  Transition metals done clear
  D)
                  All of these done clear
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• question_answer74)
  Formation of ammonia from \[{{H}_{2}}\] and \[{{N}_{2}}\] by Haber's process using \[Fe\] is an example of       [J & K 2005]
  A)
                  Heterogeneous catalysis                              done clear
  B)
                  Homogeneous catalysis done clear
  C)
                  Enzyme catalysis                              done clear
  D)
                  Non-catalytic process done clear
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