For a first order reaction A ⟶ product with initial concentration x mol L^-1, has a half life period of 2.5 hours. For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L^-1 the half life is

The decomposition of phosphine (PH₃) on tungsten at low pressure is a first order reaction. It is because the _____.

The addition of a catalyst during a chemical reaction alters which of the following quantities?

In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol^-1 and y kJ mol^-1. Therefore, the energy of activation in the backward direction is _______.

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400K? (R = 8.314 JK^-1 mol^-1)

The rate constant of a reaction is 5.8 x 10^-2  S^{​​​​​​-1} The order of the reaction is ______.

For a reaction, 2A + B ⟶ 3C, The rate of appearance of C at time 't' is 1.2 x 10^-4 mol L^-1s^-1. Identify the rate of reaction.

What would be the activation energy of a reaction when the temperature is increased from 27^oC to 37^oC?

The Unit of rate constant and rate of reaction are same for ______.

Which one of the following statements regarding order is correct?
a) Order should be determined only by experiment.
b) Order of complex reaction are less than 3.
c) Order can be determined from Stoichiometric equation.
d) Order must be a whole number.

Two reactions A ⟶ B and C ⟶ D has the energy of activation 40 kJ and 60 kJ respectively. Which of the following statement is correct?
a) Comparison of rate cannot be determined
b) The reaction A ⟶ B proceeds at a faster rate compared to the reaction C ⟶ D
c) The reaction A ⟶ B proceeds at a slower rate compared to the reaction C ⟶ D.
d) Comparison of rate cannot be determined.

Define average rate and instantaneous rate.

Derive integrated rate law for a zero order reaction A\(\longrightarrow \) product.

Explain the rate determining step with an example.

Explain the effect of catalyst on reaction rate with an example.

Consider the oxidation of nitric oxide to form NO₂
2NO_(g) + O_2(g) ➝2NO_2(g)
(a). Express the rate of the reaction in terms of changes in the concentration of NO,O₂ and NO₂.
(b). At a particular instant, when [O₂] is decreasing at 0.2 mol L⁻¹s⁻¹ at what rate is [NO₂] increasing at that instant?

The rate of the reaction X + 2y→ product is 4 x 10^-3 mol L^-1S^-1, if [X] = [Y] = 0.2M and rate constant at 400K is 2 x 10^-2s^-1, What is the overall order of the reaction.

Explain briefly the collision theory of bimolecular reactions.

Explain pseudo first order reaction with an example.

A first order reaction takes 8 hours for 90% completion. Calculate the time required for 80% completion. (log 5 = 0.6989 ; log10 = 1)

Show that in case of first order reaction, the time required for 99.9% completion is nearly ten times the time required for half completion of the reaction.

The time for half change in a first order decomposition of a substance A is 60 seconds. Calculate the rate constant. How much of A will be left after 180 seconds?

From the following data, show that the decomposition of hydrogen peroxide is a reaction of the first order:

Where t is the time in minutes and V is the volume of standard KMnO₄ solution required for titrating the same volume of the reaction mixture.