In the reaction 3A → 2B, rate of reaction +dBdt is

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 Multiple Choice QuestionsLong Answer Type

401.

The bacterial growth follows the rate law, dN/dt = kN where k is a constant and 'N' is the number of bacteria cell at any time. If the population of bacteria (number of cell) is doubled in 5 min find the time in which the population will be eight times of the initial one?


 Multiple Choice QuestionsMultiple Choice Questions

402.

A piece of wood from an archaeological sample has 5.0 counts min-1 per gram of C-14, while a fresh sample of wood has a count of 15.0 min-1g-1. If half-life of C-14 is 5770 yr, the age of the archaeological sample is

  • 8,500 yr

  • 9,200 yr

  • 10,000 yr

  • 11,000 yr


403.

Two gases X (molecular weight Mx) and Y (molecular weight My; MY > MX) are at the same temperature T in two different containers. Their root mean square velocities are CX and CY respectively. If the average kinetic energies per molecule of two gases X and Y are EX and EY respectively then which of the following realation(s) is (are) true?

  • EX > EY

  • CX > CY

  • EX = EY = (3/2) RT

  • EX = EY = (3/2) kBT


404.

A plot of ln K against 1/T (abscissa) is expected to be a straight line with an intercept on ordinate axis equal to:

  • S°2.303R

  • S°R

  • -S°R

  • R xSo


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405.

If nt number of radio atoms are present at time t, the following expression will be a constant

  • ntt

  • lnntt

  • ddt(ln nt)

  • t·nt


406.

The following graph shows how t1/2 (half-life) of a reactant, R changes with the initial reactant concentration a0. The order of the reaction will be

  • 0

  • 1

  • 2

  • 3


407.

The time taken for 10% completion of a first order reaction is 20 min. Then, for 19% completion, the reaction will take

  • 40 min

  • 60 min

  • 30 min

  • 50 min


408.

The half-life of a radioactive element is 10 h. How much will be left after 4 h in 1 g atom sample?

  • 45.6 x 1023 atom

  • 4.56 x 1023 atom

  • 4.56 x 1021 atom

  • 4.56 1020 atom


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409.

Radioactivity of a sample (Z = 22) decreases 90% after 10 yr. What will be the half-life of the sample? 

  • 5 yr

  • 2 yr

  • 3 yr

  • 10 yr


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410.

In the reaction 3A → 2B, rate of reaction +dBdt is equal to

  • -13dAdt

  • -23dAdt

  • +2dAdt

  • -32dAdt


B.

-23dAdt

For the reaction,

3A → 2B

Rate = -13dAdt = +12dBdt

 +dBdt = -23dAdt


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