MCQs of Chemical Kinetics

Showing 191 to 200 out of 228 Questions

191.

Reactants possess some minimum energy to participate in reaction. It is called _____ .

192.

At 300 K temperature, rate constant K is

3.2 \times 10^{- 4}

. What will be its value at 320 K temperature ?

193.

About what increase in the temperature of the reaction gives reaction rate double ?

194.

On what does the rate constant of reaction depend ?

(a)	Temperature
(b)	Initial concentration of reactants
(c)	Time of reaction
(d)	Amount of reactants

195.

Catalyst is a substance which _____ .

(a)	increase the equilibrium concentration of products
(b)	changes in value of equilibrium constant of reaction
(c)	decreases the time required to attain the equilibrium
(d)	supplies energy to the reaction

196.

What will change from following when concentration of reactants taking part in chemical reaction are increased ?

(a)	Enthalpy change ΔH of the reaction
(b)	Activation energy
(c)	Molecularity
(d)	Frequency of collisions

197.

A reaction is carried out at two different temperature 300 K and 280 K. What is the relation between their rate constants K₁ and K₂ ?

198.

For the reaction

X_{2} + Y_{2} \to 2 X Y + 90 kJ

, E'_a = 120 kJ. E_a for forward reaction is _____ .

199.

Which is the correct meaning of the symbol in Arrhenius equation

K = A \cdot e^{\frac{- E_{a}}{R T}}

(a)	K is the equilibrium constant of the reaction.
(b)	A is the surface areas of the reactant.
(c)	R is Rydberg's constant.
(d)	E_a is activation energy.

200.

Reaction

A_{2} + B_{2} \to 2 AB

follows the following mechanism :

$(I) A_{2} \overset{K_{1}}{\to} A + A (Fast)$

$(II) A + B_{2} \overset{K_{2}}{\to} A B + B (slow)$

$(III) A + B \overset{K_{3}}{\to} A B (fastest reaction)$

Order of reaction is _____ .

Showing 191 to 200 out of 228 Questions