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CBSE

Subject

Chemistry

NEET Chemistry : Chemical Kinetics

Multiple Choice Questions

111.

For the reaction, 2N₂O₅ $\to$ 4NO₂+ O₂rate of reaction is

$\frac{1}{2} \frac{d}{dt} [N_{2} O_{5}]$
$2 \frac{d}{dt} [N_{2} O_{5}]$
$\frac{1}{4} \frac{d}{dt} [{NO}_{2}]$
$4 \frac{d}{dt} [{NO}_{2}]$

112.

A reaction is catalysed by 'X' Here 'X' :

decreases the rate constant of reaction
does not affect the equilibrium constant of reaction
decreases the enthalpy of reaction
decreases the activation energy

113.

Half-life pf a radioactive element is :

0.693
$\frac{1}{0.693}$
$\frac{0.693}{k}$
$\frac{k}{0.693}$

114.

Which equation is correct for first order reactions ?

t_1/2 $\propto$ C^-1
t_1/2 $\propto$ C
t_1/2 $\propto$ C^o
t_1/2 $\propto$ C^1/2

115.

According to Hess's law, the heat of reaction depends upon :

initial condition of reactants
initial and final conditions of reactants
intermediate path of the reaction
end conditions of reactants

116.

Half-life of radioactive substance is 4 days . Amount of the substance decayed in two days is :

$\frac{1}{\sqrt{2}}$
1 - $\frac{1}{\sqrt{2}}$
20 %
$\frac{1}{8}$

117.

Assertion : According to transition state theory, for the formation of an activated complex, one of the vibrational degrees of freedom is converted into a translational degree of freedom.

Reason: Energy of the activated complex is higher than the energy of reactant molecules.

If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.

118.

For reaction aA → xP, when [A] = 2.2 mM, the rate was found to be 2.4 mM s^-1. On reducing concentration of A to half, the rate changes to 0.6 mM s^-1. The order of reaction with respect to A is

119.

Assertion : The kinetics of the reaction

mA + nB + pC → m'X + n'Y + p'Z

obeys the reaction as- $\frac{dx}{dt}$ = k[A]^m[B]ⁿ

Reason : The rate of reaction does not depend upon the concentration of C.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

120.

87.5% decomposition of a radioactive substance complete in 3 hours. What is the half-life of that substance ?

2 hours
3 hours
90 minutes
1 hour

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