Nuclear Chemistry Test

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Nuclear Chemistry Test - 2

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Question 1
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Directions For Questions

The following question has four choices out of which ONLY ONE is correct.

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A nuclide of an alkaline earth metal undergoes radioactive decay by the emission of α -particle in a succession. The group of the periodic table to which the resulting daughter element would belong is

A
Gr. 18

B
Gr. 6

C
Gr. 14

D
Gr. 16

Solution

When IIA group element (Ra) emits one α -particle its group no. decreases by two units, i.e. goes into zero group (Gr. 18) and produces (Rn)
Question 2
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Directions For Questions

The following question has four choices out of which ONLY ONE is correct.

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Decrease in atomic number is observed in

A
alpha-emission

B
beta-emission

C
gamma-emission

D
all of the above

Solution

Alpha emission involves removal of one proton and one neutron from the nucleus so the atomic number decreases by one.
Question 3
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Directions For Questions

The following question has four choices, out of which ONLY ONE is correct.

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The product formed is an isobar if there is

A
one alpha and one gamma emission

B
one beta and one gamma emission

C
one alpha and two beta emission

D
one positron and one gamma emission

Solution

Emission of one beta and one gamma involves no change in mass number.
Question 4
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Directions For Questions

The following question has four choices out of which ONLY ONE is correct.

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Which of the following statements regarding nuclear fusion is false?

A
Fusion process is extremely difficult to be done in a controlled manner.

B
Energy liberated per fusion is much larger than that liberated per fission.

C
Mass defect is the source of energy in fusion reaction.

Solution

Energy liberated per fusion is in fact less than that liberated per fission.
So, (2) is false.