- 1(current)
Q. No.Which of the following statements is not true for the rate constant, k?
| 1. | large value of k indicates fast reactions. |
| 2. | The value of k is independent of the concentration of reactants |
| 3. | The value of k is independent of the concentration of products |
| 4. | The value of the rate constant, k, as the name suggests is always constant for a particular reaction at all temperatures. |
Subtopic: Arrhenius Equation |
72%
Level 2: 60%+
Hints
दो कथन:
| कथन (A): | ऊष्माशोषी अभिक्रिया में अभिकारक की स्थितिज ऊर्जा उत्पाद से अधिक होती है। |
| कारण (R): | अभिकारक सक्रिय संकुल बनाते हैं जिसकी ऊर्जा अभिकारक तथा उत्पाद दोनों से कम होती है। |
| 1. | (A) और (R) दोनों सत्य, (R) (A) की सही व्याख्या |
| 2. | दोनों सत्य, लेकिन (R) (A) की सही व्याख्या नहीं |
| 3. | (A) सत्य, (R) असत्य |
| 4. | दोनों असत्य |
Subtopic: Arrhenius Equation |
65%
Level 2: 60%+
Hints
The rate of a reaction is decreased by 3.555 times when the temperature was changed from 40°C to 30°C. The activation energy (in kJ ) of the reaction is:
(Take R=8.314 J In 3.555=1.268)
1. 100 kJ/mol
2. 120 kJ/mol
3. 95 kJ/mol
4. 108 kJ/mol
Subtopic: Arrhenius Equation |
Level 3: 35%-60%
JEE
Hints
The rate constant, the activation energy and the Arrhenius parameter of a chemical reaction at \(25^{\circ}C\) are \(3\times10^{-4}~s^{-1},104.4~kJ~mol^{-1}\) and \(6\times10^{14}~s^{-1}\) respectively. The value of the rate constant as \(T\rightarrow\infty\) is
1. \(2\times10^{18}~s^{-1}\)
2. \(6\times10^{14}~s^{-1}\)
3. \(\infty\)
4. \(3.6\times10^{30}~s^{-1}\)
1. \(2\times10^{18}~s^{-1}\)
2. \(6\times10^{14}~s^{-1}\)
3. \(\infty\)
4. \(3.6\times10^{30}~s^{-1}\)
Subtopic: Arrhenius Equation |
75%
Level 2: 60%+
Hints
Unlock IMPORTANT QUESTION
This question was bookmarked by 5 NEET 2025 toppers during their NEETprep journey. Get Target Batch to see this question.
✨ Perfect for quick revision & accuracy boost
Buy Target Batch
Access all premium questions instantly
What is the pre-exponential factor for a reaction at 500 K with a rate constant of 0.02 s⁻¹ and an activation energy of 18.230 kJ?
1. 1.61
2. 1.41
3. 1.81
4. 1.21
1. 1.61
2. 1.41
3. 1.81
4. 1.21
Subtopic: Arrhenius Equation |
Level 3: 35%-60%
Hints
- 1(current)
Q. No.
© 2026 GoodEd Technologies Pvt. Ltd.