In a chemical reaction two reactants takes part. The rate of reac

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 Multiple Choice QuestionsMultiple Choice Questions

411.

If the volume of the vessel in which the reaction

2NO + O→ 2NO2

is occurring is diminished to 1/3rd of its initial volume. The rate of the reaction will be increased by

  • 3 times

  • 9 times

  • 27 times 

  • 36 times


412.

The half-life period of radioactive element is 140 days. After 560 days, 1 gram of element will reduce to

  • 1/2 g

  • 1/4g

  • 1/8 g

  • 1/16g


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413.

In a chemical reaction two reactants takes part. The rate of reaction is directly proportional to the concentration of one of them and inversely proportional to the concentration of the other. The order of reaction is :

  • 0

  • 1

  • 2

  • 4


A.

0

The order of reaction is zero. Suppose the following reaction takes place.

A + B → product

 rate = k [A][B]-1

 order = 1 + (-1) = 0


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414.

If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:

  • t = 6.909/k

  • t = 4.606/k

  • t = 2.303/k

  • t = 0.693/k


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