Chemical Kineti...

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 (C₁₂ H₂₂ O₁₁ ) 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. C₆ H₅ N₂ CI (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