Chemistry MCQs

Page No. 53

Energy required to form transition state is called _________________?


aEa

✓


bP.E

✖


cV

✖


dK.E

✖


View Answer Ea

Activated complex is formed due to________________?


apressure

✖


bEffective collision

✓


cIneffective collision

✖


dTemperature

✖


View Answer Effective collision

Which order of reaction obeys the relation t1/2 = 1/Ka____________________?


aFirst order

✖


bSecond order

✓


cThird order

✖


dZero order

✖


View Answer Second order

Rate of reaction when concentration of reactants are taken as unity is called_________________?


aArrhenius constant

✖


bMolecularity

✖


cSpecific rate constant

✓


dIdeal rate constant

✖



When a graph is plotted between 1/T on X-axis and log k on y-axis a straight line is obtained with a negative slope which has two end in__________________?


aI and II quadrant

✖


bII and III quadrant

✖


cIII and IV quadrant

✖


dII and IV quadrant

✓


View Answer II and IV quadrant

In rate expression the concentration of reactants is negative. It shows_______________?


aConcentration of reactant does not change

✖


bConcentration of product increases

✖


cConcentration of reactant decreases

✓


dConcentration of reactant increases

✖



Sum of exponents of molar concentration is called___________________?


aOrder of reaction

✓


bMolecularity

✖


cRate of reaction

✖


dAverage of reaction

✖


View Answer Order of reaction

On increasing the temperature the rate of reaction increases mainly because_________________?


aThe activation energy of the reaction increases

✖


bConcentration of the reacting molecules increases

✖


cCollision frequency increases

✓


dNone of these

✖



The addition of a catalyst to the reaction system__________________?


aIncreases the rate of forward reaction only

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bIncreases the rate of reverse reaction

✖


cIncreases the rate of forward but decreases the rate of backward reaction

✖


dIncreases the rate of forward as well as backward reaction equally

✓



Which of the following type of reaction is 3rd order reaction_________________?


a2N2O5 = 2N2O4 + O3

✖


bNO + O3 ? NO2 + O2

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cNO + O3 ? NO2 + O2

✓


dNone of these

✖


View Answer NO + O3 ? NO2 + O2

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