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Kinetics - Nuclear - Surface - Photochemistry - Chemistry MCQ


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60 Questions MCQ Test Mock Test Series for IIT JAM Chemistry - Kinetics - Nuclear - Surface - Photochemistry

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Kinetics - Nuclear - Surface - Photochemistry - Question 1

Activation energy for decomposition of H2O2 is 76 kJ/mol at 298K and the decomposition is very slow. When a little iodide is added, the activation energy decreases to 57kJ/mol. Hence, rate coefficient increases by a factor of           

Kinetics - Nuclear - Surface - Photochemistry - Question 2

The rate of radioactive disintegration ..........with time:           

Kinetics - Nuclear - Surface - Photochemistry - Question 3

For opposing reaction, A + B ↔ C + D, Ea = 100 kJ/mol and A = 1010 M-1s-1. The equilibrium concentration of A, B, C, D are 1, 2, 5, 4 M resp., at 700K. The values of k1 and k-1 at this temp are-    

Kinetics - Nuclear - Surface - Photochemistry - Question 4

If 0.001M of a substance quenches the efficiency of fluorescence by 20%, the value of Stern-Volmer constant in M-1 is      

Kinetics - Nuclear - Surface - Photochemistry - Question 5

Decomposition of ammonia on tungsten at 850oC has a rate constant value of 0.10 Torr sec-1. If the initial pressure of ammonia is 100 Torr, the pressure of ammonia at t = 200 sec is     

Kinetics - Nuclear - Surface - Photochemistry - Question 6

The value of the rate constant for the gas phase reaction, 2NO2 + F2 → 2NO2F  is 38 dm3 mol–1 s–1 at 300 K. The order of the reaction is:    

Kinetics - Nuclear - Surface - Photochemistry - Question 7

A reaction follows second order rate law, 

Kinetics - Nuclear - Surface - Photochemistry - Question 8

The specific rate constant of decomposition of a compound is represented by​

The activation energy of decomposition for this compound at 300 K is:           

Kinetics - Nuclear - Surface - Photochemistry - Question 9

The fluorescence life time of a molecule in solution is 10 ns. If the fluorescence quantum yield is 0.1, the rate constant of fluorescence decay is:    

Kinetics - Nuclear - Surface - Photochemistry - Question 10

For the reaction shown below,

The value of k1 is 1 × 10–4 s–1. If the reaction starts from X, the ratio of the concentrations of Y and Z at any given time during the course of the reaction is found to be  The value of k2 is:

Kinetics - Nuclear - Surface - Photochemistry - Question 11

For an adsorbant-adsorbate system obeying the Langmuir adsorption isotherm, K = 0.48 bar-1 and P = 0.16 bar-1. At what pressure will 50% of the surface be covered?             

Detailed Solution for Kinetics - Nuclear - Surface - Photochemistry - Question 11

Given data
b = 0.48 bar-1
p = 0.16 bar-1
Substitute in the corresponding equation

Kinetics - Nuclear - Surface - Photochemistry - Question 12

The reaction, 2NO(g) + O2(g)  → 2NO2(O)  proceeds via the following steps:  
   
The rate of this reaction is equal to    

Kinetics - Nuclear - Surface - Photochemistry - Question 13

The decomposition of N2O5 according to following reaction is first order             
2 N2O5 → 4 NO2(g) + O2 (g). After 30 minutes from the start of decomposition in a closed vessel the total pressure developed is found to be 250 mm of Hg and on complete decomposition the total pressure is 500 mm of Hg. Calculate rate constant of the reaction.    

Detailed Solution for Kinetics - Nuclear - Surface - Photochemistry - Question 13

For the given reaction:
2N2​O5​(g)→4NO2​(g)+O2​(g)

  a                       0                0    -------- initial time (t=0)
 a−X                   2X           X/2  ------- after time (t=30 min)

   0                      2a          a/2     ----- after complete reaction
∵ No. of mole at any time ∝ pressure developed at that time

∴a ∝ P0​ at t=0 -----1
a+(3X/2)∝284.5 at t=30   ------ 2
(5a/2)∝584.5 at t=completely reacted ------ 3

From 1 and 3 equation, we get

∴a ∝ 233.8  ----------------------- 4

Substituting 4 in 2 equation we get

X∝33.8  --------------------------------- 5

Now,
∴ K = 2.303/t ​log a​/(a−X)
∴ K = 2.303/30 ​log233.8​/200

= 5.206 × 10-3min-1

Kinetics - Nuclear - Surface - Photochemistry - Question 14

1 g of 90Sr gets converted to 0.953 g after 2 yr. The half-life of 90Sr, and the amount of 90Sr remaining after 5 yr are:    

Kinetics - Nuclear - Surface - Photochemistry - Question 15

A graph is plotted between log10K and 1/T in which straight line BC has no slope and tan(ᴓ) = -1/2.303 and intercept on y-axis is 5. What is activation energy?    

Kinetics - Nuclear - Surface - Photochemistry - Question 16

In a reaction, → Product, rate is doubled when the concentration of is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (Aand B) are doubled, rate law for the reaction can be written as

Kinetics - Nuclear - Surface - Photochemistry - Question 17

 when the rate of the reaction is equal to the rate constant, the order of the reaction is

Detailed Solution for Kinetics - Nuclear - Surface - Photochemistry - Question 17

Ans: a 

Explanation: According to rate law the rate of reaction is given by the expression: 

rate = k[conc.] x 

Whereas, x is the overall order of the reaction. To make the rate of reaction equal to the rate constant (k), the order of the reaction (x) should be zero. 

Thus, the rate of reaction is equal to rate constant, the order of the reaction is '0'.

Kinetics - Nuclear - Surface - Photochemistry - Question 18

The inversion of cane sugar proceeds with half-life of 500 minutes at pH 5 for any concentration of sugar. However if pH = 6, the half-life changes to 50 minute. The rate law expression for the sugar inversion can be written as:

Kinetics - Nuclear - Surface - Photochemistry - Question 19

The reaction, A(g) + 2B(g) → C(g) + D(g) is an elementary process. In an experiment, the initial partial pressure of A and B are PA = 0.60 and PB = 0.80 atm. When PC = 0.2 atm the rate of reaction relative to the initial rate is:    

Kinetics - Nuclear - Surface - Photochemistry - Question 20

For an enzyme catalyzed reaction, a Lineweaver-Burk plot gave the slope value = 40 s and intercept = 4 (mmoldm-3s-1)-1. If initial concentration of enzyme is 2.5× 10-9 moldm-3, catalytic efficiency is 10x. Calculate the value of ‘x’.           

Kinetics - Nuclear - Surface - Photochemistry - Question 21

At 273 K, N2 is adsorbed on mica surface. A plot of 1/V vs 1/P (V in m3 and P in Torr) gives a straight line with slope equal to 2.0 × 10–5 torr m–3 and an intercept Vm equal to 4 × 10–8 m3. The adsorption coefficient and number of molecules of N2 forming monolayer, resp., are:

Kinetics - Nuclear - Surface - Photochemistry - Question 22

Physiosorbed particles undergo desorption at 270C with an activation energy of 16.628 kJ/mol. Assuming first order process and a frequency factor of 1012 Hz, the average residence time (in sec) of particles on the surface is

Kinetics - Nuclear - Surface - Photochemistry - Question 23

A monoatomic gas, X absorbed on a surface, Langmuir, A plot of the fraction of surface coverage, q against the concentration of the gas [X], for very low concentration of the gas, is described by the equation: 

Kinetics - Nuclear - Surface - Photochemistry - Question 24

Which of the following transformations is not correct?

Kinetics - Nuclear - Surface - Photochemistry - Question 25

Which ones of the following reactions are artificial radioactive decay?

Kinetics - Nuclear - Surface - Photochemistry - Question 26

A, B, C and D elements form compounds AC, A2D and BD. If AC and A2D are radioactive and BD is not radioactive compound, find the following radioactive compounds-           
(I) A2                                       (II) A2C                          (III) C2D                        (IV) BC           

Kinetics - Nuclear - Surface - Photochemistry - Question 27

A substance absorbs 2.0 x 1016 quanta or radiations per second and 0.002 mole of it reacts in 1200 seconds. What is the quantum yield or the reaction (N = 6.02 x 1023)?           

Kinetics - Nuclear - Surface - Photochemistry - Question 28

Which regions of the light radiations of the visible ultraviolet lying between – wavelength are chiefly concerned in bringing about photochemical reactions?           

Kinetics - Nuclear - Surface - Photochemistry - Question 29

A closed vessel with rigid walls contain 1 mol of 92U238 and 1 mol of air at 298K. Considering complete decay of 92U238 to 82U206, the ratio of the final pressure to the initial pressure of the system at 298K is____?           

Kinetics - Nuclear - Surface - Photochemistry - Question 30

The periodic table consists of 18 groups. An isotope of copper, on bombardment with protons, undergoes a nuclear reaction yielding element X as shown below. To which group, element X belongs in periodic table? 29Cu63 + 1H1 → X + 2 1H1 + α + 6 0n1    

*Multiple options can be correct
Kinetics - Nuclear - Surface - Photochemistry - Question 31

Considering the following parameters with reference to fluorescence of a solution. The correct answer for the enhancement of fluorescence with the increase in these parameters is/are    

*Multiple options can be correct
Kinetics - Nuclear - Surface - Photochemistry - Question 32

Which one of the following nuclear reaction is/are correct?           

*Multiple options can be correct
Kinetics - Nuclear - Surface - Photochemistry - Question 33

Which among the following is/are correct about Isodiaphers?           

*Multiple options can be correct
Kinetics - Nuclear - Surface - Photochemistry - Question 34

Which of the following is secondary effect?           

*Multiple options can be correct
Kinetics - Nuclear - Surface - Photochemistry - Question 35

Which of the following statements is correct?           

*Multiple options can be correct
Kinetics - Nuclear - Surface - Photochemistry - Question 36

Which of the following is/are true about Chemisorption?            

*Multiple options can be correct
Kinetics - Nuclear - Surface - Photochemistry - Question 37


Which of the following statements are correct?           

*Multiple options can be correct
Kinetics - Nuclear - Surface - Photochemistry - Question 38

Which of the following are the reactions in which molecules absorbing light do not themselves react but induce other molecules to react?                  

*Multiple options can be correct
Kinetics - Nuclear - Surface - Photochemistry - Question 39

What are the appropriate reasons for deviations from Beer’s law among following?           

*Multiple options can be correct
Kinetics - Nuclear - Surface - Photochemistry - Question 40

Which ones of the following statements are true for half-life of radioactive matters?           

*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 41

It was found that cane sugar solution in water was hydrolyzed to the extent 25 per cent in one hour. Calculate the time (in hours) that will be taken for the sugar to get hydrolyzed to the extent of 50%, assuming that the reaction is of the first order: [rounded up to first decimal place]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 42

A drug becomes ineffective after 30% decomposition. The original concentration of a sample was 5mg/mL which becomes 4.2 mg/mL during 20 months. Assuming the decomposition of first order, calculate the expiry time (in months) of the drug in months. 


Detailed Solution for Kinetics - Nuclear - Surface - Photochemistry - Question 42

*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 43

The reaction is first order in both the directions. The forward and reverse rate constants are 4.2 × 10–4s–1 and 1.04 × 10–3 s–1, respectively. The relaxation time for this reaction, in seconds, in a temperature jump experiment is…………….? [rounded up to two decimal place]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 44

A first order reaction is 20% completed in 10 minutes. Calculate the time (in minutes) taken for the reaction to go to 80% completion: [rounded up to two decimal places]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 45

The rate of a reaction triple when temperature changes from 20°C to 50°C. Calculate energy (J/mol) of activation for the reaction (R = 8.314 JK–1 mol–1). [rounded up to first decimal place]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 46

210Bi undergoes β decay to 1/8 of its initial amount in 15 days. The time required for its decay to 1/4 of its initial amount is……… days:


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 47

The half-life of a radioactive element is 30 min. The time interval between the stages of 33.3% and 67.7% decay will be (in min): [rounded up to first decimal place]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 48

A 0.1 M solution of compound A shows 50% transmittance when a cell of 1 cm width is used at λ1 nm. Another 0.1 M solution of compound B gives the optical density value of 0.1761 using 1cm cell at λ1 nm. What will be the transmittance of a solution that is simultaneously 0.1 M in A and 0.1 M in B using the same cell and at the same wave length? [log 1.301; log 1.4771; log 50 = 1.699]. (rounded up to two decimal places)


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 49

Half-life for a third order reaction 3C → products, where Co is initial concentration of C will be 1/[zKCo2]. The value of ‘z’ is? [rounded up to two decimal places]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 50

For non-dissociative Langmuir type adsorption of a gas on solid surface at a particular temp, the fraction of surface coverage is 0.6 at 30 bar. The Langmuir isotherm constant (in bar-1) at this temp is? [rounded up to two decimal places]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 51

In Arrhenius equation for a certain reactions, the value of A and Ea (Activation energy) are 4 × 1013 sec–1 and 98.6 kJ/mol respectively. At what temperature (K), the reaction will have specific rate constant 1.1 × 10–3 sec–1? [rounded up to first decimal place]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 52

At 407 K the rate constant of a chemical reaction is 9.5 × 10–5s–1 and at 420 K, the rate constant is 1.9 × 10–4s–1. Calculate the frequency factor of the reaction: [rounded up to two decimal places]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 53

The decomposition of Cl2O7 at 400 K in the gas phase to Cl2 and O2 is of Ist order. After 55 sec at 400 K, the pressure of Cl2O7 falls from 0.062 to 0.044 atm. Calculate pressure (atm) of Cl2O7 after 100 seconds: [rounded up to three decimal places]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 54

A sample of 53I131, as iodide ion, was administered to a patient in a carrier consisting of 0.10 mg of stable iodide ion. After 4.00 days, 67.7% of the initial radioactivity was detected in the thyroid gland of the patient. What mass (in mg) of the stable iodide ion had migrated to the thyroid gland?
Given T1/2 I131 = 8 days.  [rounded up to three decimal places]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 55

For the reaction,
 at 900 K, the following data are obtained:

Find the value of rate constant (in atm–2 min–1). [rounded up to two decimal places]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 56

Two substances A and B are present such that [A0] = 4[B0] and half-life of A is 6 minute and that of B is 15 minute. If they start decaying at the same time following first order kinetics, how much time (min) later will the concentration of both of them would be same?


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 57

For the first order reaction  the initial pressure is PA = 90 mm Hg, the pressure after 10 minutes is found to be 180 mm Hg. The rate constant (in sec-1)of the reaction is
Q × 10–3: Therefore, Q is­­­ __? [rounded up to two decimal places]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 58

Radioactive decay is a first order process. Radioactive carbon wood sample decays with a half-life of 5770 years. What fraction would remain after 11540 years? [rounded up to three decimal places]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 59

Vmax and KM for an enzyme catalyzed reactions are 2.0 × 10–3 Ms-1 and 1.0 × 10–6 M resp., The rate of reaction when substrate concentration is 1.0 × 10–6 M is? [up to three decimal places]


*Answer can only contain numeric values
Kinetics - Nuclear - Surface - Photochemistry - Question 60

First order rate constant for unimolecular gas phase reaction A → products that follows Lindemann mechanism is 2 s-1 at PA = 1 atm and 4 s-1 at PA = 2 atm. The rate constant (in atm-1s-1) for activation step is?


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