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CBSE

Subject

Chemistry

NEET Chemistry : Chemical Kinetics

Multiple Choice Questions

91.

The concentration of a reactant X decreases from 0.1 M to 0.005 Min 40 min .If the reaction follows first order kinetics , the rate of the reaction when the concentration of X is 0.01 M will be :

1.73 x 10^-4 M min^-1
3.47 x 10^-4 M min^-1
3.47 x 10^-5 M min^-1
7.5 x 10^-4 M min^-1

92.

Assertion : The overall order of the reaction is the sum of the exponents of all the reactants in the rate expression.

Reason : There are many higher order reactions.

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.

93.

Which one of the following is a second order reaction ?

H₂ + Br₂ $\to$ 2HBr
NH₄NO₃ $\to$ N₂ + 3H₂O
H₂ + Cl₂ $\overset{Sunlight}{\to}$ 2HCl
CH₃COOCH₃ + NaOH $\to$ CH₃COONa + CH₃OH

94.

The t_0.5 of a radioactive isotope is 1.5 h .How long will it take for its activity to be reduced to $\frac{1}{16}$ of its original value ?

3.0 h
360 min
4.5 h
600 min

95.

If 8. 0 g of a radioactive isotope has a half-life of 10 yr .The half-life of 2.0 g of the same substance is :

2.5 yr
5 yr
20 yr
lO yr

96.

Assertion : Two different reactions can never have same rate of reaction.

Reason : Rate of reaction always depends only on frequency of collision and Arrhenius factor.

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.

97.

For a reaction X $\to$ Y,the graph ofthe product concentration (x) versus time (t) came out to be a straight line passing through the origin. Hence the graph of $\frac{- d [X]}{dt}$ and time would be

straight line with a negative slope and an intercept on y-axis
straight line with a positive slope and an intercept on y-axis
a straight line parallel to x-axis
a hyperbola.

98.

The IUPAC name of the compound :

is :

2 - ethyl - 2 - methyl - 3 - hexanone
5 - ethyl - 5 - methyl - 4 - hexanone
5 , 5 - dimethyl - 4 - heptanone
3 , 3 - dimethyl - 4 - heptanone

99.

The gas phase reaction of nitric oxide and bromine yields nitrosyl bromide :

2NO (g) + Br₂ (g) $\to$ 2NOBr (g)

The rate law is rate = k[NO]²[Br₂]

The overall reaction order is :

100.

Assertion : Rate of reaction of alkyl halide in Williamson's synthesis reaction is 1°RX > 2°RX > 3 $°$ RX.

Reason : It is a type of bimolecular substitution reaction (S_N2).

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

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