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First Order Reaction Questions

Practice 9 First Order Reaction questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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9
Total Questions
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1
Easy
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6
Medium
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2
Hard
Practice by Exam:Chemistry(8)CHEMISTRY(1)

About First Order Reaction — practice questions, PYQs & concepts

First Order Reaction is a frequently-tested topic on Chemistry, CHEMISTRY. ExamTest.live currently lists 9 First Order Reaction questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

First Order Reaction weight in competitive exams

Across our First Order Reaction question bank, the largest sources are Chemistry (8) and CHEMISTRY (1). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 1 easy First Order Reaction questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
  • Time yourself: Every question shows the average solve time so you can benchmark your speed against other students.
  • Read every explanation: Even on questions you got right — the explanation often surfaces a faster approach you can reuse.

All First Order Reaction Questions(1–9 of 9)

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Q1mediummcqChemistryAIEEE2026
0% accuracy
is the time taken for the concentration of a reactant to drop to of its initial value. If the rate constant is , is:
Q2mediummcqChemistryNEET (UG) 20172026
0% accuracy
A first order reaction has a specific reaction rate of . How much time will it take for of the reactant to reduce to ?
Q3mediummcqChemistryNEET 20172026
A first order reaction has a specific reaction rate of . How much time will it take for of the reactant to reduce to ?
Q4hardmcqCHEMISTRYNEET 20192026
A first-order reaction has a rate constant of . The time required for of this reactant to reduce to will be: [Given ]
Q5mediummcqChemistryAIEEE 20042026
In a first order reaction, the concentration of the reactant decreases from to in minutes. The time taken for the concentration to change from to is:
Q6mediummcqChemistryAIEEE 20092026
The half life period of a first order chemical reaction is . The time required for the completion of of the chemical reaction will be ():
Q7mediummcqChemistryChemistry
3% accuracy
If the half-life () for a first order reaction is minute, then the time required for completion of the reaction is closest to:
Q8easymcqChemistryChemistry
Half life period of a first-order reaction is . The specific rate constant of the reaction is:
Q9hardmcqChemistryChemistry
The rate of a first-order reaction is at and at after initiation of the reaction. The half-life period of the reaction is:

Frequently Asked Questions

How many First Order Reaction questions are on ExamTest.live?▼
We have 9 First Order Reaction questions spread across 1 pages, covering easy, medium, and hard difficulty levels with detailed explanations.
Are First Order Reaction MCQs free?▼
Yes. All First Order Reaction questions, answers, and explanations on ExamTest.live are completely free. No account or subscription required.
Which exams include First Order Reaction questions?▼
First Order Reaction questions are commonly asked in Chemistry, CHEMISTRY. You can filter by exam using the links above.
How do I practice First Order Reaction questions effectively?▼
Start with easy questions to build confidence, then tackle medium and hard ones. Use the filter buttons to sort by difficulty. Reveal the answer only after attempting each question, and read the explanation thoroughly.