Nuclear and Environmental Chemistry Practice Questions
JEE · Chemistry · 1444 free MCQs with instant results and detailed explanations.
1444
Total
311
Easy
657
Medium
476
Hard
Start Practicing Nuclear and Environmental Chemistry
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Topics in Nuclear and Environmental Chemistry
Nuclear Reactions
371
Air and Water Pollution
350
Radioactivity
342
Green Chemistry
381
Sample Questions from Nuclear and Environmental Chemistry
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What type of radiation is emitted during the decay of a radioactive isotope?
A.
Alpha particles
B.
Beta particles
C.
Gamma rays
D.
All of the above
Show Answer & Explanation
Correct Answer: D
Radioactive decay can release alpha particles, beta particles, and gamma rays, depending on the isotope and the mode of decay.
Q2
Easy
If a radioactive isotope has a half-life of 3 years, how much of a 100g sample will remain after 9 years?
A.
12.5g
B.
25g
C.
50g
D.
75g
Show Answer & Explanation
Correct Answer: A
After 9 years, which is three half-lives, the amount remaining is 100g / (2^3) = 12.5g.
Q3
Easy
Which of the following is NOT a unit of radioactivity?
A.
Curies
B.
Becquerels
C.
Grays
D.
Rads
Show Answer & Explanation
Correct Answer: C
Grays measure absorbed dose of radiation, not the radioactivity itself, which is measured in Curies or Becquerels.
Q4
Medium
Which of the following statements about alpha particles is NOT true?
A.
They are positively charged.
B.
They can penetrate paper.
C.
They consist of 2 protons and 2 neutrons.
D.
They are emitted during alpha decay.
Show Answer & Explanation
Correct Answer: B
Alpha particles have low penetration ability and cannot penetrate paper, unlike beta particles or gamma rays, which can.
Q5
Medium
If a sample of a radioactive element has a decay constant of 0.693 day^-1, what is its half-life?
A.
1 day
B.
0.693 days
C.
2 days
D.
0.5 days
Show Answer & Explanation
Correct Answer: A
The half-life (t_1/2) can be calculated using the formula t_1/2 = ln(2) / decay constant. Here, ln(2) is approximately 0.693, thus giving a half-life of 1 day.
Q6
Medium
If the decay constant of a radioactive substance is 0.693 per year, what is its half-life?
A.
0.693 years
B.
1 year
C.
2 years
D.
3 years
Show Answer & Explanation
Correct Answer: A
The half-life (T_1/2) is calculated as T_1/2 = ln(2) / decay constant. Since ln(2) is approximately 0.693, the half-life is 1 year.
Q7
Medium
Which of the following is NOT a common application of radioactive isotopes?
A.
Medical imaging
B.
Agricultural pest control
C.
Carbon dating
D.
Electricity generation through fusion
Show Answer & Explanation
Correct Answer: D
Electricity generation through fusion typically does not involve radioactive isotopes; it uses different processes.
Q8
Hard
In radioactive decay, which process results in a decrease in atomic number by 2 and mass number by 4?
A.
Beta decay
B.
Alpha decay
C.
Gamma decay
D.
Positron emission
Show Answer & Explanation
Correct Answer: B
Alpha decay emits an alpha particle, which consists of 2 protons and 2 neutrons, thus reducing both atomic and mass number accordingly.
Q9
Hard
What is the energy released during the complete decay of 1 mole of 238U to stable 206Pb, considering the mass defect is 4.2 u?
A.
1000 MeV
B.
2000 MeV
C.
3000 MeV
D.
4000 MeV
Show Answer & Explanation
Correct Answer: D
The energy released in nuclear reactions can be calculated using E = Δmc^2, and multiplying by Avogadro's number gives the total energy released per mole.
Q10
Hard
What is the decay mode of 14C during its transformation to 14N?
A.
Alpha decay
B.
Beta decay
C.
Gamma decay
D.
Neutron emission
Show Answer & Explanation
Correct Answer: B
14C undergoes beta decay by converting a neutron into a proton, resulting in an increase in atomic number and formation of 14N.
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Nuclear and Environmental Chemistry — JEE Chemistry Practice Questions Online
This page contains 1444 practice MCQs for the chapter Nuclear and Environmental Chemistry in JEE Chemistry. The questions are organized by difficulty — 311 easy, 657 medium, 476 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.