# Balbharati solutions for Chemistry 11th Standard Maharashtra State Board chapter 13 - Nuclear Chemistry and Radioactivity [Latest edition]

## Chapter 13: Nuclear Chemistry and Radioactivity

Exercises
Exercises [Pages 202 - 203]

### Balbharati solutions for Chemistry 11th Standard Maharashtra State Board Chapter 13 Nuclear Chemistry and Radioactivity Exercises [Pages 202 - 203]

Exercises | Q 1. (A) | Page 202

Choose the correct option.

Identify nuclear fusion reaction _____________

$\ce{^1_1H + ^1_1H -> ^2_1H + ^0_1e}$

$\ce{^2_1H + ^1_1H -> ^3_2He}$

$\ce{^3_1H + ^1_1H -> ^3_1H + ^1_1p}$

Exercises | Q 1. (B) | Page 202

Choose the correct option.

The missing particle from the nuclear reaction is ____________

$\ce{^27_13Al + ^4_2He -> ? + ^1_0n}$

• $\ce{^30_15P}$

• $\ce{^32_16S}$

• $\ce{^14_10Ne}$

• $\ce{_14Si}$

Exercises | Q 1. (C) | Page 202

Choose the correct option.

$\ce{^60_27CO}$ decays with a half-life of 5.27 years to produce $\ce{^60_28Ni}$. What is the decay constant for such radioactive disintegration?

• 0.132 y-1

• 0.138

• 29.6 y

• 13.8%

Exercises | Q 1. (D) | Page 202

Choose the correct option.

The radioactive isotope used in the treatment of Leukemia is ______.

• $\ce{^60Co}$

• $\ce{^226Ra}$

• $\ce{^32P}$

• $\ce{^226I}$

Exercises | Q 1. (E) | Page 202

Choose the correct option.

The process by which nuclei having low masses are united to form nuclei with large masses is ______.

• chemical reaction

• nuclear fission

• nuclear fusion

• chain reaction

Exercises | Q 2. (A) | Page 202

On the basis of even-odd of protons and neutrons, what type of nuclides is most stable?

Exercises | Q 2. (B) | Page 202

Explain in brief, nuclear fission.

Exercises | Q 2. (C) | Page 202

The nuclides with odd number of both protons and neutrons are the least stable. Why?

Exercises | Q 2. (D) | Page 202

Referring the stability belt of stable nuclides, which nuclides are β and β+ emitters? Why?

Exercises | Q 2. (E) | Page 202

Explain with an example each nuclear transmutation and artificial radioactivity. What is the difference between them?

Exercises | Q 2. (F) | Page 202

What is the binding energy per nucleon?

Exercises | Q 2. (F) | Page 202

Explain with the help of a diagram how binding energy per nucleon affects nuclear stability?

Exercises | Q 2. (G) | Page 202

Explain with example α - decay.

Exercises | Q 2. (H) | Page 202

The energy produced in nuclear fusion is much larger than that produced in nuclear fission. Why is it difficult to use fusion to produce energy?

Exercises | Q 2. (I) | Page 202

How does N/Z ratio affect nuclear stability? Explain with a suitable diagram.

Exercises | Q 2. (J) | Page 202

You are given a very old sample of wood. How will you determine its age?

Exercises | Q 3. (A) | Page 202

Give an example of mirror nuclei.

Exercises | Q 3. (B) | Page 202

Balance the nuclear reaction:

$\ce{^118_54Xe -> ? + I^118_54}$

Exercises | Q 3. (C) | Page 202

Name the most stable nuclide known.

Exercises | Q 3. (C) | Page 202

Write two factors responsible for its stability.

Exercises | Q 3. (D) | Page 202

Write relation between decay constant of a radioelement and its half-life.

Exercises | Q 3. (E) | Page 202

What is the difference between an α-particle and helium atom?

Exercises | Q 3. (F) | Page 202

Write one point that differentiates nuclear reactions from chemical reactions.

Exercises | Q 3. (G) | Page 202

Write pairs of isotones and one pair of mirror nuclei from the following:

$\ce{^10_5B, ^12_6C, ^27_13Al, ^11_6C, ^28_14S}$

Exercises | Q 3. (H) | Page 202

Derive the relationship between half-life and decay constant of a radioelement.

Exercises | Q 3. (I) | Page 202

Represent graphically log10 (activity/dps) versus t/s. What is its slope?

Exercises | Q 3. (J) | Page 202

Write two units of radioactivity. How are they interrelated?

Exercises | Q 3. (K) | Page 202

The half-life of 24Na is 900 minutes. What is its decay constant?

Exercises | Q 3. (L) | Page 202

Decay constant of 197Hg is 0.017 h-1. What is its half-life?

Exercises | Q 3. (M) | Page 202

The total binding energy of 58Ni is 508 MeV. What is its binding energy per nucleon?

Exercises | Q 3. (N) | Page 202

The atomic mass of $\ce{^32_16S}$ is 31.97 u. If masses of neutron and H atom are 1.0087 u and 1.0078 u respectively. What is the mass defect?

Exercises | Q 3. (O) | Page 203

Write the fusion reactions occurring in the Sun and stars.

Exercises | Q 3. (P) | Page 203

How many α and β-particles are emitted in the transmutation $\ce{^232_90Th -> ^208_82Pb}$?

Exercises | Q 3. (Q) | Page 203

A produces B by α-emission. If B is in group 16 of the periodic table, what is the group of A?

Exercises | Q 3. (R) | Page 203

Find the number of α and β-particles emitted in the process $\ce{^222_86Rn -> ^214_84Po}$.

Exercises | Q 4. (A) | Page 203

The half-life of 18F is 110 minutes. What fraction of 18F sample decays in 20 minutes?

Exercises | Q 4. (B) | Page 203

The half-life of 35S is 87.8 d. What percentage of 35S sample remains after 180 d?

Exercises | Q 4. (C) | Page 203

The half-life of 67Ga is 78 h. How long will it take to decay 12% of the sample of Ga?

Exercises | Q 4. (D) | Page 203

0.5 g sample of 201Tl decays to 0.0788 g in 8 days. What is its half-life?

Exercises | Q 4. (E) | Page 203

65% of 111In sample decays in 4.2 d. What is its half-life?

Exercises | Q 4. (F) | Page 203

Calculate the binding energy per nucleon of $\ce{^84_36Kr}$ whose atomic mass is 83.913 u. (Mass of neutron is 1.0087 u and that of H atom is 1.0078 u).

Exercises | Q 4. (G) | Page 203

Calculate the energy in MeV released in the nuclear reaction $\ce{^174_77Ir -> ^170_75Re + ^4_2He}$

Atomic mass: Ir = 173.97 u, Re = 169.96 u and He 4.0026 u

Exercises | Q 4. (H) | Page 203

A 3/4 of the original amount of radioisotope decays in 60 minutes. What is its half-life?

Exercises | Q 4. (I) | Page 203

How many particles are emitted by 0.1 g of 226Ra in one year?

Exercises | Q 4. (J) | Page 203

A sample of 32P initially shows activity of one Curie. After 303 days, the activity falls to 1.5 × 104 dps. What is the half-life of 32P?

Exercises | Q 4. (K) | Page 203

The half-life of radon is 3.82 d. By what time would 99.9% of radon will be decayed?

Exercises | Q 4. (L) | Page 203

It has been found that the Sun’s mass loss is 4.34 × 109 kg per second. How much energy per second would be radiated into space by the Sun?

Exercises | Q 4. (M) | Page 203

A sample of old wood shows 7.0 dps/g. If the fresh sample of tree shows 16.0 dps/g, how old is the given sample of wood? (Half-life of 14C is 5730 y)

Exercises

## Balbharati solutions for Chemistry 11th Standard Maharashtra State Board chapter 13 - Nuclear Chemistry and Radioactivity

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Concepts covered in Chemistry 11th Standard Maharashtra State Board chapter 13 Nuclear Chemistry and Radioactivity are Introduction: Nuclear Chemistry is a Branch of Physical Chemistry, Classification of Nuclides, Nuclear Stability, Radioactivity, Radioactive Decays, Modes of Decay, Nuclear Reactions, Applications of Radio Isotopes.

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