NEET Exam  >  NEET Tests  >  Chemistry Class 12  >  Test: Temperature Dependence of a Reaction - NEET MCQ

Test: Temperature Dependence of a Reaction - NEET MCQ


Test Description

10 Questions MCQ Test Chemistry Class 12 - Test: Temperature Dependence of a Reaction

Test: Temperature Dependence of a Reaction for NEET 2024 is part of Chemistry Class 12 preparation. The Test: Temperature Dependence of a Reaction questions and answers have been prepared according to the NEET exam syllabus.The Test: Temperature Dependence of a Reaction MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Temperature Dependence of a Reaction below.
Solutions of Test: Temperature Dependence of a Reaction questions in English are available as part of our Chemistry Class 12 for NEET & Test: Temperature Dependence of a Reaction solutions in Hindi for Chemistry Class 12 course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt Test: Temperature Dependence of a Reaction | 10 questions in 15 minutes | Mock test for NEET preparation | Free important questions MCQ to study Chemistry Class 12 for NEET Exam | Download free PDF with solutions
Test: Temperature Dependence of a Reaction - Question 1

How many times the rate of reaction increases at 200C for a reaction having the activation energies in the presence and absence of catalyst as 50 kJ/mol and 75 kJ/mol?

Detailed Solution for Test: Temperature Dependence of a Reaction - Question 1

K = Ae^(-Ea/RT)

Taking ln on both sides

lnk = lnA + (-Ea/R) x 1/T

Now ATQ: lnk1 = lnA + (-Ea1/R) x 1/T

lnk2 = lnA + (-Ea2/R) x 1/T

Subtracting the two equations

ln(k2/k1) = (Ea1 - Ea2)/RT

ln(k2/k1) = (75 - 50) x 1000 / 8.314 x 293

K2/K1 = e (25000 / 8.314 x 293)

K2/K1 = e10.26

This is approximately equal to 30000.

Hence C is correct.

Test: Temperature Dependence of a Reaction - Question 2

If Ef and Eb are the activation energies of the forward and reverse reactions and the reaction is known to be exothermic, then:

Detailed Solution for Test: Temperature Dependence of a Reaction - Question 2

The correct answer is Option B.

For exothermic reaction, ΔH<0
Eb = Ef + ∣ΔH∣ or
Ef < Eb

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Temperature Dependence of a Reaction - Question 3

The ratio of the rate constant of a reaction at two temperatures differing by __________0C is called temperature coefficient of reaction.

Detailed Solution for Test: Temperature Dependence of a Reaction - Question 3

The ratio of the rate constant of a reaction at two temperatures differing by 100C is called temperature coefficient of reaction.

Test: Temperature Dependence of a Reaction - Question 4

The effect of temperature on reaction rate is given by

Test: Temperature Dependence of a Reaction - Question 5

The activation energies of two reactions are given as Ea1= 40 J and Ea2= 80 J, then the relation between their rate constants can be written as:

Detailed Solution for Test: Temperature Dependence of a Reaction - Question 5

The correct answer is Option A.

As the value of activation energy, Ea increases, the value of rate constant, k decreases.
 
So, k1 > k2 since E1 < E2

Test: Temperature Dependence of a Reaction - Question 6

The activation energy of a chemical reaction can be determined by

Detailed Solution for Test: Temperature Dependence of a Reaction - Question 6

The correct answer is Option C
Activation energy can be determined by evaluation rate constants at different temperatures using equation:

Where, K2 = rate constant at temperature T2
             K1= rate constant at temperature T1

Test: Temperature Dependence of a Reaction - Question 7

The rate constant, activation energy and Arrhenius parameter of a chemical reaction at 25°C are 3.0 x 10-4 s-1, 104.4 kJ mol-1 and 6.0 x 1014 s-1 respectively. The value of the rate constant at infinite temperature is is

Detailed Solution for Test: Temperature Dependence of a Reaction - Question 7

The correct answer is option C
Arrhenius equation
⇒ K = Ae−Ea/RT
As T → ∞,
RT → ∞

e−Ea/RT  → 1
Hence K → A as T→∞
∴ Value of K as T → ∞ = 6.0×1014S−1

Test: Temperature Dependence of a Reaction - Question 8

 The plot of ln k vs 1/T is a straight line. The slope of the graph is:

Detailed Solution for Test: Temperature Dependence of a Reaction - Question 8

The Arrhenius equation is k=Ae−Ea​/RT 

ln k = ln A - Ea/RT

comparing with y = mx+c where y = ln k and x = 1/T, slope m becomes -Ea/R

so when ln k vs 1/T is plotted, the slope comes out to be - Ea/R

Test: Temperature Dependence of a Reaction - Question 9

For a chemical reaction the rate constant is nearly doubled with the rise in temperature by

Detailed Solution for Test: Temperature Dependence of a Reaction - Question 9

B is the right answer.

Rate constant is doubled with 10 degree rise in temperature.

Test: Temperature Dependence of a Reaction - Question 10

 The reactions with low activation energy are

Detailed Solution for Test: Temperature Dependence of a Reaction - Question 10

The correct answer is Option C.

The reactions with low activation energies are always fast whereas the reactions with high activation energy are always slow. The process of speeding up a reaction by reducing its activation energy is known as catalysis, and the factor that's added to lower the activation energy is called a catalyst.

135 videos|348 docs|182 tests
Information about Test: Temperature Dependence of a Reaction Page
In this test you can find the Exam questions for Test: Temperature Dependence of a Reaction solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Temperature Dependence of a Reaction, EduRev gives you an ample number of Online tests for practice

Top Courses for NEET

135 videos|348 docs|182 tests
Download as PDF

Top Courses for NEET