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Physical Chemistry -- Nuclear Chemistry
11.
Which of the following radioactive series is artificial?
- A.Thorium series (4n)
- B.Neptunium series (4n + 1)
- C.Uranium series (4n + 2)
- D.Actinium series (4n + 3)
- Answer
- Report
Answer : [B]
12.
A freshly prepared radioelement has a half-life of 2 hours. It emits
radiation whose intensity is 64 times the permissible safe level. The
minimum time after which it would be possible to work with this sample
is
- A.3 hours
- B.9 hours
- C.24 hours
- D.1
- Answer
- Report
Answer : [D]
13.
The count rate of 200 mL of a radioactive liquid sample is x. Some of the
liquid is now discarded. The count rate of the remaining liquid is found
to be x/20 after four half-lives. The volume in millilitres of the remaining
liquid is
- A.160
- B.80
- C.40
- D.10
- Answer
- Report
Answer : [A]
14.
80% of the radioactive nuclei present in a sample are found to remain
undecayed after one day. The percentage of undecayed nuclei left after
two days will be
- A.64
- B.20
- C.46
- D.80
- Answer
- Report
Answer : [A]
15.
Which of the following processes results in an increase in the atomic
number of a nuclide?
- A.Alpha emission
- B.Electron capture
- C.Beta emission
- D.Positron emission
- Answer
- Report
Answer : [C]
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