Chemical Kineti...

Direction (Q. Nos. 1-21) This section contains 21 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q. For zeroth order reaction,

A → B

[A]₀ = 0.01 M, [A]_t = 0.008Matter 10 min.

Thus, half-life is

A Certain Zeroth Order reaction has k = 0.025 Ms^-1 for the disappearance of A. What will be the concentration of A after 15s, if the intial concentration is 0.50 M?

For Zeroth Order Reaction, variation of x with time is shown as 

Q. At initial concenration of the reactant as 17.32 min dm^-1 , half - life period is 

For the first order reaction, rate constant k is given by

kt = logC₀ - log C_t

where, C₀ is the intial concenration and C_t is the concentration at time t. Graph between log C_t and time t is

In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M is 15 min. The time taken for the concentration to change from 0.1 M to 0.025 M is

For the First order reaction, concentration of the reactant after two averagelives is reduced to

The half-life period of a first order chemical reaction is 6.93 min. The time required for the completion of 99% of the chemical reaction will be (log2 = 0.3010)

[AIEEE 2009]

For the first order reaction,

A → Product

Q. The concentration of A changes from 0.1 M to 0.025 M in 40 min. The rate of the reaction when the concentration of A is 0.01 M is

[AIEEE 2012]

For the reaction,

A → Products,      

Concentration of A at different time intervals are given :

At 20 min, rate will be

For the first order reaction with, C₀ as the initial concentration and C at time  t, (C₀ - C) =

The radioisotope N-13 which has a half-life of 10 min is used to image organs in the body. If the injected sample has an activity of 40 μCi (microcurie), what is the activity after 30 min?

The following data were obtained during the first order decomposition of

2A(g) → B(g) + C(s)

at constant volume and at a particular temperature : 

Thus, rate constant is

A G .M. Counter is used to study the process of first order of radioactive disintegration. In the absence of radioactive substance A, it counts 3 dps (disintegration per second). When A is placed in G.M Counter it records 23 dps at the start and 13 dps after 10 min. It records x dps after next 10 min. Half-life period of A is y min. Thus, x and y are

Inversion of sucrose (C₁₂H₂₂O₁₁) is a first order reaction and is studied by measuring angle of rotation at different interval of time

r₀ = angle of rotation at the start, r_t = angle of rotation at time t
r_∞ = angle of rotation at the complete reaction

There is 50% inversion, when

Following radioactive disintegration follows first order kinetics :

Starting with 1 mol of A in a 1L flask at 300 K, pressure set up after two half-lifes is approximately

For the first order reaction T_av (average life), T₅₀ (half-life) and T₇₅ (time 75% reaction) are in the ratio of

For the first order reaction,

Following equations are given :

Select the correct equations.

Rate constant of a first order reaction (A → B) is 0.0693 min^-1. If initial concentration is 1.0 M, rate after 30 min is

Following reaction is pseudo-unimolecular w.r.t. C₆H₅N₂CI (A)

50 mL of 1M benzene diazonium chloride (A) is taken. After 1 h, 1.226 L of N₂ gas at 1 atm and 300 K is obtained. Thus, half-life of the reaction is (log 250 = 2.40) 

Minimum half-life of an isotope needed so that not more than 0.1 % of the nuclei undergo decay during a 3.0 h laboratory experiment is

Naturally occurring potassium consists of 0.01% at 40 K which has a half-life of 1.28 x 10⁹ yr. Activity of 1.00 g sample of KCl is