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Test: Rate of reactions - JEE MCQ


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15 Questions MCQ Test Chemistry for JEE Main & Advanced - Test: Rate of reactions

Test: Rate of reactions for JEE 2025 is part of Chemistry for JEE Main & Advanced preparation. The Test: Rate of reactions questions and answers have been prepared according to the JEE exam syllabus.The Test: Rate of reactions MCQs are made for JEE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Rate of reactions below.
Solutions of Test: Rate of reactions questions in English are available as part of our Chemistry for JEE Main & Advanced for JEE & Test: Rate of reactions solutions in Hindi for Chemistry for JEE Main & Advanced course. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free. Attempt Test: Rate of reactions | 15 questions in 20 minutes | Mock test for JEE preparation | Free important questions MCQ to study Chemistry for JEE Main & Advanced for JEE Exam | Download free PDF with solutions
Test: Rate of reactions - Question 1
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The reaction rate is defined as the rate at which the concentration of the reactants __________ with time or the concentration of products ___________ with time.

Detailed Solution for Test: Rate of reactions - Question 1

The reaction rate is defined as the rate at which the concentration of the reactants decreases with time or the concentration of products increases with time.

Test: Rate of reactions - Question 2
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Consider the following reaction
A⟶ Products
This reaction is completed in 100 min. The rate constant of this reaction at t1 = 10 min, is 10−2 min−1. What is the rate constant (in min−1) at t2 = 20 min?

Detailed Solution for Test: Rate of reactions - Question 2

For a first order reaction, rate constant does not depend upon concentration.
∴ Rate constant at also (constant).

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Test: Rate of reactions - Question 3
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Which of the following terms would not be determined experimentally?

Detailed Solution for Test: Rate of reactions - Question 3
Molecularity of a reaction is simply the number of molecules reacting in balanced chemical equation. It can be simply determined by examining balanced equation.
Test: Rate of reactions - Question 4
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Consider the reaction

The equality relationship between and is
Detailed Solution for Test: Rate of reactions - Question 4
If we write rate of reaction in terms of concentration of and , then
Rate of reaction
So,
Test: Rate of reactions - Question 5
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A following mechanism has been proposed for reaction 2 A + B → D + E
A + B → C + D(slow)
A + C → E (fast)
The rate law expression for the reaction is:
Detailed Solution for Test: Rate of reactions - Question 5

From slow reaction
Rate

Test: Rate of reactions - Question 6
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The rate law for the reaction is Rate The correct statement with regard to this relation is
Detailed Solution for Test: Rate of reactions - Question 6

The given reaction is

∴ Rate of formation of is half of the rate of disappearance of .

Test: Rate of reactions - Question 7
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In a reaction, products, the concentration of decreases from to in . What is the rate of disappearance of A (in ) during this interval?
Detailed Solution for Test: Rate of reactions - Question 7

R.O.D of A
Given,



Rate .

Test: Rate of reactions - Question 8
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A chemical reaction is catalyzed by a catalyst Hence X
Detailed Solution for Test: Rate of reactions - Question 8
A catalyst affects equally both forward and backward reactions, therefore it does not affect equilibrium constant of reaction.
Test: Rate of reactions - Question 9
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A catalyst is a substance which :
Detailed Solution for Test: Rate of reactions - Question 9

A catalyst is a substance that:

  • Participates in the reaction by forming intermediate compounds.
  • Lowers the activation energy, providing an easier pathway for the reaction to occur.
  • Does not alter the equilibrium position but speeds up the reaction rate by facilitating both the forward and reverse reactions equally.
  • Remains chemically unchanged at the end of the reaction.

Analysis of Options:

a) Incorrect: A catalyst can be in the same phase or a different phase as the reactants (homogeneous or heterogeneous catalyst).
b) Incorrect: A catalyst does not alter the equilibrium but only affects the time to reach equilibrium.
c) Incorrect: A catalyst participates in the reaction by forming intermediates, although it remains unchanged in the end.
d) Correct: A catalyst participates in the reaction and provides a pathway with lower activation energy, increasing the reaction rate.
 

Final Answer:

(d) participates in the reaction and provides an easier pathway for the same.

Test: Rate of reactions - Question 10
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The inversion of cane sugar proceeds with half-life of 500 minute at for any concentration of sugar. However if , the half-life changes to 50 minute. The rate law expression for the sugar inversion can be written as
Detailed Solution for Test: Rate of reactions - Question 10
At , the half-life is independent of the concentration of sugar. Hence, the reaction is of first order in sugar.
The rate law expression is rate sugar .
The relationship between half life and is





Hence, the rate law expression is .
Test: Rate of reactions - Question 11
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Reaction rates are determined by all of the following factors except:
Detailed Solution for Test: Rate of reactions - Question 11
Reaction rates are determined by all except the spontaneity of the reaction. All the other factors influence reaction rate because for a reaction to happen particles must collide with sufficient energy and in the right orientation. The energy which is required is termed the activation energy. Many spontaneous reactions like the combustion of ethanol do not happen at observable rates under standard conditions because the particles do not have energy which matches or exceeds the activation energy. All the other factors determine, reaction rates.
Test: Rate of reactions - Question 12
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For a reaction , rate of disappearance of ' is related to the rate of appearance of 'B' by the expression
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Rate of reaction
or
Test: Rate of reactions - Question 13
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The terms rate of reaction and rate of appearance (or disappearance) of reactant (or product)
Detailed Solution for Test: Rate of reactions - Question 13
The rate of reaction and rate of appearance (or disappearance) of a reactant (or product) are different quantities unless its stoichiometric number in chemical equation is one.
Test: Rate of reactions - Question 14
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For the reaction in alkaline aqueous solution, the value of the second order (in ) rate constant at in the rate law was found to be
. Rate constant when the rate law is written for is
Detailed Solution for Test: Rate of reactions - Question 14


So, Rate

Test: Rate of reactions - Question 15
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A G.M. counter is used to study the radioactive process of first-order. In the absence of radioactive substance , it counts 3 disintegration per second (dps). When is placed in the G.M. counter, it records 23 dps at the start and 13 dps after 10 minutes. It records dps after next 10 minutes and has half-life period y minutes. and are
Detailed Solution for Test: Rate of reactions - Question 15

There is error of 3 dps


Thus, half-life minutes
In next 10 minutes dps
∴ recorded value with error

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