If the volume of the vessel in which the reaction2NO + O2 &r

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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


C.

27 times 

Rate of reaction is directly proportional to concentration of reactant and inversely proportional to the volume of vessel.

Concentration ∝ nV

For a given reaction,

2NO (g) + O2 (g)  2NO2 (g)

Rate of reaction = k[NO]2[O2]

If volume of vessel is reduced by 13rd of its initial value, then concentration of compound is increased by 3 times. Hence, the rate of reaction will be increased by 27 times.


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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


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


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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