The rate of a first-order reaction is 0.04 mol L^-1s^-1 at 10 sec and 0.03 mol^-1L^-1 s^-1 at 20 sec after initiation of the reaction. the half-life period of the reaction is 

• 34.1 s

• 44.1 s

• 54.1 s

• 54.1 s

The ionic radii of A⁺ and B^- ions are 0.98 x 10^-10 m and 1.81 x10^-10 m. The coordination number of each ions in AB is 

• 4

• 8

• 2

• 2

The activation energy of a reaction can be determined from the slope of which of the following graphs? 

• InK vs T

• 
• 
• 

274.

When initial concentration of a reactant is doubled in a reaction, its half-life period os not affected the order of the reaction is?

• Zero

• first

• second

• second

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20⁰C to 35⁰C ?(R=8.314 J mol^-1 K^-1).

• 342 kJ mol^-1

• 269 kJ mol^-1

• 34.7 kJ mol^-1

• 34.7 kJ mol^-1

In a reaction, A+B → Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled. Rate law for the reaction can be written as

• Rate = k[A][B]²

• Rate = k[A]²[B]²

• Rate = k[A][B]

• Rate k[A]²[B]

In Freundlich adsorption isotherm, the value of 1/n is

• between 0 and 1 in all cases

• between 2 and 4 in all cases

• 1 in case of physical adsorption

• 1 in case of chemisorption

In a zero order reaction for every 10^o rise of temperature, the rate is doubled. If the temperature is increased from 10^oC to 100^oC, the rate of the reaction will become

• 256 times

• 512

• 64 times

• 128 times

Activation energy (E_a) and rate constants (k₁ and k₂) of chemical reaction at two different temperatures (T₁ and T₂) are related by

Which one of the following statements for the order of a reaction is correct?

• Order is not influenced by stoichiometric coefficient of the reactants

• Order of reaction is sum of power to the concentration terms of reactants to express the rate of reaction

• Order  of reaction is always the whole number

• Order  of reaction is always the whole number