Chemical Kinetics · JEE Main previous year questions

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2021 15 questions

Q622021 · 1 Sept 2021 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q782021 · 26 Aug 2021 · Shift 2
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Heavy water is used for the study of reaction mechanism. Reason (R) : The rate of reaction for the cleavage of O - H bond is slower than that of O - D bond. Choose the most appropriate answer from the options given below :
1. A.Both (A) and (R) are true but (R) is not the true explanation of (A).
2. B.Both (A) and (R) are true and (R) is the true explanation of (A).
3. C.(A) is false but (R) is true.
4. D.(A) is true but (R) is false.
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Answer: D
Q792021 · 27 Jul 2021 · Shift 2
Select the correct statements (A) Crystalline solids have long range order. (B) Crystalline solids are isotropic (C) Amorphous solid are sometimes called pseudo solids. (D) Amorphous solids soften over a range of temperatures. (E) Amorphous solids have a definite heat of fusion. Choose the most appropriate answer from the options given below.
1. A.(A), (B), (E) only
2. B.(B), (D) only
3. C.(C), (D) only
4. D.(A), (C), (D) only
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Answer: D
Q892021 · 27 Jul 2021 · Shift 2· Numerical answer
For the first order reaction $A \to 2B$ , 1 mole of reactant A gives 0.2 moles of B after 100 minutes. The half life of the reaction is __________ min. $[U se : ln 2 = 0.69, ln 10 = 2.3]$ Properties of logarithms : $ln x^{y} = y ln x$ ; $ln (\frac{x}{y}) = ln x - ln y$ (Round off to the nearest integer)
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Answer: 600 to 700
Q672021 · 25 Jul 2021 · Shift 1
1. A.(b) Zero order (c) and (e) First order
2. B.(a) and (b) Zero order (e) First order
3. C.(b) and (d) Zero order (e) First order
4. D.(a) and (b) Zero order (c) and (e) First order
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Answer: D
Q852021 · 25 Jul 2021 · Shift 2· Numerical answer
For a chemical reaction $A \to B$ , it was found that concentration of B is increased by 0.2 mol $L^{-}$ in 30 min. The average rate of the reaction is ____ $\times 1 0^{- 1} mol L^{- 1} h^{- 1}$ . (in nearest integer)
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Answer: 4
Q762021 · 22 Jul 2021 · Shift 2
Isotope(s) of hydrogen which emits low energy $β^{-}$ particles with $t_{1/2}$ value > 12 years is/are
1. A.Protium
2. B.Tritium
3. C.Deuterium
4. D.Deuterium and Tritium
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Answer: B
Q882021 · 22 Jul 2021 · Shift 2· Numerical answer
$N_{2} O_{5 (g)} \to 2N O_{2 (g)} + \frac{1}{2} O_{2 (g)}$ In the above first order reaction the initial concentration of $N_{2} O_{5}$ is $2.40 \times 1 0^{- 2} mol L^{- 1}$ at 318 K. The concentration of $N_{2} O_{5}$ after 1 hour was $1.60 \times 1 0^{- 2} mol L^{- 1}$ . The rate constant of the reaction at 318 K is ____ $\times 1 0^{- 3} mi n^{- 1}$ . (Nearest integer) [Given : log 3 = 0.477, log 5 = 0.699]
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Answer: 7
Q882021 · 20 Jul 2021 · Shift 1· Numerical answer
The inactivation rate of a viral preparation is proportional to the amount of virus. In the first minute after preparation, $10%$ of the virus is inactivated. The rate constant for viral inactivation is ________ $\times 1 0^{- 3} min^{- 1}$ . (Nearest integer) [Use : $ln 10 = 2.303$ ; $lo g_{10} 3 = 0.477$ ; property of logarithm : $lo g x^{y} = y lo g x$ ]
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Answer: 106
Q832021 · 18 Mar 2021 · Shift 1· Numerical answer
$2 NO (g) + C l_{2} (g) ⇌ 2 NOCl (s)$ This reaction was studied at $- 1 0^{\circ}$ and the following data was obtained $Run 123 [N O]_{0} 0.10 0.10 0.20 [C l_{2}]_{0} 0.10 0.20 0.20 r_{0} 0.18 0.35 1.40$ $[N O]_{0}$ and $[C l_{2}]_{0}$ are the initial concentrations and $r_{0}$ is the initial reaction rate. The overall order of the reaction is ____. (Round off to the Nearest Integer).
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Answer: 3
Q872021 · 18 Mar 2021 · Shift 2· Numerical answer
A reaction has a half life of 1 min. The time required for 99.9% completion of the reaction is _________ min. (Round off to the Nearest Integer). [Use : ln 2 = 0.69; ln 10 = 2.3]
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Answer: 10
Q892021 · 16 Mar 2021 · Shift 1· Numerical answer
The decomposition of formic acid on gold surface follows first order kinetics. If the rate constant at 300 K is $1.0 \times 1 0^{- 3} s^{- 1}$ and the activation energy $E_{a} = 11.488 kJ mol^{- 1}$ , the rate constant at 200 K is _______ $\times 1 0^{- 5} s^{- 1}$ . (Round off to the Nearest Integer). (Given : $R = 8.314 J mol^{- 1} K^{- 1}$ )
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Answer: 10
Q822021 · 26 Feb 2021 · Shift 1· Numerical answer
An exothermic reaction $X \to Y$ has an activation energy $30 kJ mo l^{- 1}$ . If energy change $Δ E$ during the reaction is $- 20 kJ$ , then the activation energy for the reverse reaction in kJ is _________. (Integer answer)
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Answer: 50
Q822021 · 26 Feb 2021 · Shift 2· Numerical answer
If the activation energy of a reaction is $80.9 kJ mo l^{- 1}$ , the fraction of molecules at 700 K, having enough energy to react to form products is $e^{- x}$ . The value of x is _________. (Rounded off to the nearest integer) [Use $R = 8.31 J K^{- 1} mo l^{- 1}$ ]
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Answer: 14
Q882021 · 25 Feb 2021 · Shift 2· Numerical answer
The rate constant of a reaction increases by five times on increase in temperature from $2 7^{\circ} C$ to $5 2^{\circ} C$ . The value of activation energy in $kJ mo l^{- 1}$ is ____. (Rounded off to the nearest integer) $[R = 8.314 J K^{- 1} mo l^{- 1}]$
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Answer: 52