| ⇦ | 
| ⇨ |
If the initial concentration of the reactant is doubled, the time for half reaction is also doubled. Then the order of the reaction is
Options
(a) zero
(b) fraction
(c) three
(d) one
Correct Answer:
zero
Explanation:
We know for a reaction of n th order. k = 1/(n-1)t [1/(a-x)ⁿ⁻¹ – 1/aⁿ⁻¹].
when t=t(1/2), a-x = a/2.
t(1/2) = 1/(n-1)K [ 1/(a/2)ⁿ⁻¹ – 1/aⁿ⁻¹] …(i).
This time for t(1/2).
When a=2a, then time period for half reaction(t) is given by,
t = 1/(n-1)k [1/(a)ⁿ⁻¹ -1/(2a)ⁿ⁻¹]..(ii).
But t = 2t(1/2) , from (i) and (ii)
t(1/2)/t = [1/(a/2)ⁿ⁻¹ – 1/aⁿ⁻¹] / (1/a)ⁿ⁻¹ – 1/(2a)ⁿ⁻¹ .
1/2 = aⁿ⁻¹ – (a/2)ⁿ⁻¹/(a/2)ⁿ⁻¹ ⨯ (2a)ⁿ⁻¹ / (2aⁿ⁻¹- aⁿ⁻¹).
1/2 = (a/2)ⁿ⁻¹ (2ⁿ⁻¹ -1) / (a/2)ⁿ⁻¹ ⨯ (2a)ⁿ⁻¹/aⁿ⁻¹ (2ⁿ⁻¹ – 1).
1/2 = (2)ⁿ⁻¹ ⇒ n = 0. Thus order of the reaction is zero.
Related Questions: - Reaction of solid KMnO₄ ith conc.H₂SO₄ produces manganese heptoxide (Mn₂O₇) in
- Bleaching powder is prepared from the reaction of
- Bleaching powder is obtained by treating Cl₂ with
- Nitrogen is obtained by the thermal decomposition of
- Which of the following statements about primary amines is false
Topics: Electrochemistry and Chemical Kinetics
(87)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Reaction of solid KMnO₄ ith conc.H₂SO₄ produces manganese heptoxide (Mn₂O₇) in
- Bleaching powder is prepared from the reaction of
- Bleaching powder is obtained by treating Cl₂ with
- Nitrogen is obtained by the thermal decomposition of
- Which of the following statements about primary amines is false
Topics: Electrochemistry and Chemical Kinetics (87)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply