Nuclear Chemistry Test

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Nuclear Chemistry Test - 3

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Question 1
1 / -0

Directions For Questions

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

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Atom of a radioactive element emits 1 alpha, 3 beta, and 1 gamma particles in succession. The final change in the atomic number is:

A
It increases by 2

B
It increases by 1

C
It increases by 4

D
It increases by 5

Solution

Emission of 2 alpha particles decreases the atomic number by 2. Emission of three beta particles increases the atomic number by 3.

Emission of gamma particles does not change atomic number.
Question 2
1 / -0

Directions For Questions

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

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Atoms of the same element but having different energy states and spins are known as

A
isotopes

B
isoelectronics

C
isodiaphers

D
nuclear isomers

Solution

Nuclear isomers are the same atoms but with different energy states and spins.
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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Principle of atomic bomb is

A
fusion

B
chain reaction

C
controlled fission

D
chemical reaction

Solution

Principle of atom bomb is chain reaction.
Question 4
1 / -0

Directions For Questions

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

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A radioactive element is reduced by 40% in 10 years. In how many decades will it be reduced to 36%?

A
1

B
2

C
3

D
4

Solution

It loses 40% in 10 years and is reduced to 60%. This will lose another 6040/100 = 24% in next 10 years to become 60 - 24 = 36%. So, the required time is 10 + 10 = 20 years or 2 decades.

The correct time is 2 decades.
Question 5
1 / -0

Directions For Questions

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

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Which of the following types of radiations is composed of particles with charge and mass identical to those of an electron?

A
Alpha particles

B
Beta particles

C
Gamma radiation

D
X-rays

Solution

This type of radiation is composed of particles with charge and mass identical to those of an electron.