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Chemical Kinetics

Multiple Choice Questions

411.

If the volume of the vessel in which the reaction

2NO + O₂→ 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

1/16g

$T = n \times t_{1 / 2} where, t_{1 / 2} = half life period, n = \frac{T}{t_{1 / 2}} = \frac{560}{140} = 4 now, N_{t} = N_{\circ} {(\frac{1}{2})}^{n} = 1 \times {(\frac{1}{2})}^{4} = \frac{1}{16} g$

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 :