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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The rate of a first-order reaction is 0.04 mol L-1s-1 at 10 sec and 0.03 mol-1L-1 s-1 at 20 sec after initiation of the reaction. the half-life period of the reaction is 

  • 34.1 s

  • 44.1 s

  • 54.1 s

  • 54.1 s

3236 Views

2.

The ionic radii of A+ and B- ions are 0.98 x 10-10 m and 1.81 x10-10 m. The coordination number of each ions in AB is 

  • 4

  • 8

  • 2

  • 2

3911 Views

3.

The activation energy of a reaction can be determined from the slope of which of the following graphs? 

  • InK vs T

  • fraction numerator In space straight K over denominator straight T end fraction space v s space T
  • In space straight K space vs 1 over straight T
  • In space straight K space vs 1 over straight T
884 Views

4.

When initial concentration of a reactant is doubled in a reaction, its half-life period os not affected the order of the reaction is?

  • Zero

  • first

  • second

  • second

2750 Views

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5.

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200C to 350C ?(R=8.314 J mol-1 K-1).

  • 342 kJ mol-1

  • 269 kJ mol-1

  • 34.7 kJ mol-1

  • 34.7 kJ mol-1

2629 Views

6.

In a reaction, A+B → Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled. Rate law for the reaction can be written as

  • Rate = k[A][B]2

  • Rate = k[A]2[B]2

  • Rate = k[A][B]

  • Rate k[A]2[B]

775 Views

7.

In Freundlich adsorption isotherm, the value of 1/n is

  • between 0 and 1 in all cases

  • between 2 and 4 in all cases

  • 1 in case of physical adsorption

  • 1 in case of chemisorption

875 Views

8.

In a zero order reaction for every 10o rise of temperature, the rate is doubled. If the temperature is increased from 10oC to 100oC, the rate of the reaction will become

  • 256 times

  • 512

  • 64 times

  • 128 times

1380 Views

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9.

Activation energy (Ea) and rate constants (k1 and k2) of chemical reaction at two different temperatures (T1 and T2) are related by

  • ln space k subscript 2 over k subscript 1 space equals negative E subscript a over R open parentheses 1 over T subscript 1 minus 1 over T subscript 2 close parentheses
  • ln space k subscript 2 over k subscript 1 space equals negative E subscript a over R open parentheses 1 over T subscript 2 minus 1 over T subscript 1 close parentheses
  • ln space k subscript 2 over k subscript 1 space equals negative E subscript a over R open parentheses 1 over T subscript 2 plus 1 over T subscript 1 close parentheses
  • ln space k subscript 2 over k subscript 1 space equals negative E subscript a over R open parentheses 1 over T subscript 2 plus 1 over T subscript 1 close parentheses
772 Views

10.

Which one of the following statements for the order of a reaction is correct?


  • Order is not influenced by stoichiometric coefficient of the reactants

  • Order of reaction is sum of power to the concentration terms of reactants to express the rate of reaction

  • Order  of reaction is always the whole number

  • Order  of reaction is always the whole number

344 Views

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