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CBSE

NEET Chemistry : Chemical Kinetics

Multiple Choice Questions

131.

In the reaction 3A → 2B, rate of reaction $+ \frac{d (B)}{dt}$ is equal to

$- \frac{1}{3} \frac{d [A]}{dt}$
$- \frac{2}{3} \frac{d [A]}{dt}$
$+ \frac{2 d [A]}{dt}$
$- \frac{3}{2} \frac{d [A]}{dt}$

Long Answer Type

132.

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 Questions

133.

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

134.

Two gases X (molecular weight M_x) and Y (molecular weight M_y; M_Y > M_X) are at the same temperature T in two different containers. Their root mean square velocities are C_X and C_Y respectively. If the average kinetic energies per molecule of two gases X and Y are E_X and E_Y respectively then which of the following realation(s) is (are) true?

E_X > E_Y
C_X > C_Y
E_X = E_Y = (3/2) RT
E_X = E_Y = (3/2) k_BT

135.

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

$\frac{∆ S °}{2.303 R}$
$\frac{∆ S °}{R}$
$- \frac{∆ S °}{R}$
R x $∆$ S^o

136.

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

$\frac{n_{t}}{t}$
$\ln \frac{n_{t}}{t}$
$\frac{d}{dt} (\ln nt)$
$t \cdot n_{t}$

137.

The following graph shows how t_1/2 (half-life) of a reactant, R changes with the initial reactant concentration a_0. The order of the reaction will be

138.

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

139.

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

140.

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

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Subject

NEET Chemistry : Chemical Kinetics

Multiple Choice Questions

Long Answer Type

Multiple Choice Questions