MCQs of Chemical Kinetics

Chemical Kinetics MCQs

MCQs of Chemical Kinetics

Showing 121 to 130 out of 228 Questions

121.

The unit of rate constant for third order reaction is _____ .

(a)	$\frac{{(litre)}^{2}}{{(mole)}^{2} (second)}$
(b)	${second}^{- 1}$
(c)	${[\frac{mole}{litre}]}^{- 1} {second}^{- 1}$
(d)	${[\frac{litre}{mole}]}^{2} second$

122.

An elementary reaction occurs in a closed vessel.

$2 {CO}_{(g)} + O_{2 (g)} \to 2 {CO}_{2 (g)}$

If the volume of the reaction vessel is made one third of its original volume at constant temperature, the rate of the reaction _____ of its original rate .

(a)	becomes three times
(b)	becomes twenty seven times
(c)	becomes nine times
(d)	becomes eighteen times

123.

The value of reaction rate constant K is 175 litre² mole ^-2 second ^-1 . What is the order of reaction ?

(a)	Zero
(b)	First
(c)	Second
(d)	Third

124.

What is the unit of k for forth order reaction ?

(a)	(mole / litre)^-3
(b)	(mole / litre)^-3 second
(c)	(mole / litre)⁺³ second^-1
(d)	(mole / litre)^-3 second^-1

125.

For reaction

A + B \to Product

_____ .

(i)If concentration of only A is doubled, the reaction rate also doubles.

(ii) If concentration of A and B both are doubled, the reaction rate increases by 8 times.

Which of the following reaction rates applies to this reaction ?

(a)	$Rate = K {[A]}^{2} {[B]}^{2}$
(b)	$Rate = K [A] [B]$
(c)	$Rate = K {[A]}^{2} [B]$
(d)	$Rate = K [A] {[B]}^{2}$

126.

Which of the following statements is wrong with respect to order of reaction ?

(a)	Order of reaction can be determined only experimentally.
(b)	Order of reaction has no relation with stoichiometric coefficients.
(c)	Order of reaction is equal to the sum of the exponential terms of concentrations of reactants expressed in reaction rate equation.
(d)	Order of reaction is always an integral number.

127.

If rate if a reaction =

K {[A]}^{\frac{3}{2}} {[B]}^{- 1}

, state the order of reaction .

(a)	$\frac{3}{2}$
(b)	$\frac{1}{2}$
(c)	0
(d)	$\frac{4}{2}$

128.

To what is molecularity of reaction applicable ?

(a)	Only elementary reactions.
(b)	Only complex reactions.
(c)	Elementary and complex both reactions.
(d)	None of the above

129.

Which of the following statements is correct for monomolecular reactions ?

(a)	At high pressure / concentration their order of reaction is 1.
(b)	At high pressure / concentration their order of reaction is 2.
(c)	At low pressure or concentration their order of reaction is 1.
(d)	At low pressure or concentration, their order of reaction is zero.

130.

Which set of the values of respectively, molecularity and order of reaction is not consistent ?

(a)	2, 1.5
(b)	4, 0
(c)	1.5, 8
(d)	3, -0.5

Showing 121 to 130 out of 228 Questions