MCQs of Chemical Kinetics

Chemical Kinetics MCQs

MCQs of Chemical Kinetics

Showing 101 to 110 out of 228 Questions

101.

Which of the following reaction will be fastest ?

(a)	$C_{2} H_{5} I + {OH}^{-} \to C_{2} H_{5} OH + I^{-}$
(b)	${CH}_{3} Cl + {CH}_{3} ONa \to {CH}_{3} - O - {CH}_{3} + NaCl$
(c)	$3 {AgNO}_{3} + K_{3} {PO}_{4} \to {Ag}_{3} {PO}_{4} + 3 {KNO}_{3}$
(d)	${CH}_{3} {COOCH}_{3} + H_{2} O \to {CH}_{3} COOH + {CH}_{3} OH$

102.

For a gaseous reaction,

A + 2 B \to Product

Rate = K [A] {[B]}^{2}

. If volume of the reaction (system) is quickly reduced 4 times, what will be the effect on its rate ?

(a)	Will increase 16 times
(b)	Will increase 64 times
(c)	Will decrease 4 times
(d)	Will decrease 64 times

103.

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

(a)	Its $t_{\frac{1}{2}}$ is proportional to square of initial concentration .
(b)	Its molecularity is always 2.
(c)	Unit of K is L² mole^-2 s^-1
(d)	Its reaction rate follows, $rate \propto {[R]}_{0}^{2}$ formula.

104.

For an unknown reaction,

K = 5 \times 10^{- 4} \min^{- 1}

. What is its order of reaction ?

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

105.

What is the relation between the concentration of reactant and the unit of rate constant K ?

(a)	$K \propto {[Reactant]}^{n - 1}$
(b)	$K \propto \frac{1}{{[Reactant]}^{n - 1}}$
(c)	$K \propto {[Reactant]}^{\frac{n}{2}}$
(d)	$K \propto {[Reactant]}^{n}$

106.

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

(a)	A second order reaction can be bimolecular .
(b)	The value of reaction order can be zero, positive, negative or fractional and it is determined experimentally.
(c)	As temperature increases, the value of order of reaction increases .
(d)	Reactions having high order are rarely seen.

107.

How much time is required for completion of a zero order reaction ?

(a)	$\frac{2 [R_{0}]}{K}$
(b)	$\frac{[R_{0}]}{2 K}$
(c)	$\frac{[R_{0}]}{K}$
(d)	$\frac{K}{[R_{0}]}$

108.

If order of reaction with respect to the reactant A is 2, then _____ .

(a)	reaction rate is proportional to the concentration of A
(b)	reaction rate is proportional to ${[A]}^{2}$
(c)	the value of $t_{\frac{1}{2}}$ is proportional to ${[R]}_{0}^{2}$
(d)	if concentration of A doubled, the value of K is also becomes double

109.

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

(a)	34.1 s
(b)	44.1 s
(c)	54.1 s
(d)	24.1 s

110.

The decomposition of phosphine ( pH₃) on tungsten at low pressure is a first-order reaction. it is because the.

(a)	Rate is independent of the surface coverage
(b)	Rate of decomposition is very slow
(c)	Rate is proportional to the surface coverage
(d)	Rate is inversely proportional to the surface coverage

Showing 101 to 110 out of 228 Questions